KR20060080843A - Liquid crystal display device - Google Patents

Abstract

In order to provide a liquid crystal display device of MVA mode having a substantially high aperture ratio and being applicable to a notebook computer and having good display quality even when viewed in an inclined direction, the liquid crystal display device of the present invention is disposed to face each other with a liquid crystal layer interposed therebetween. It consists of the TFT substrate and the opposing board | substrate which were made. Moreover, in the liquid crystal layer, the polymerization component added in the liquid crystal is polymerized and formed, and the polymer which determines the direction in which a liquid crystal molecule inclines at the time of voltage application is formed. In the TFT substrate, subpixel electrodes 121b directly connected to the TFT 118 and subpixel electrodes 121a and 121c connected to the TFT 118 through capacitive coupling are formed. On these subpixel electrodes 121a to 121c, slits 122 extending in the directions of 45 °, 135 °, 225 ° or 315 ° with respect to the X axis are formed.

TFT substrate, channel passivation layer, auxiliary capacitance electrode, data bus line, slit

Description

Liquid crystal display {LIQUID CRYSTAL DISPLAY DEVICE}

1 is a plan view illustrating an example of a liquid crystal display device of a conventional MVA mode.

Fig. 2 is a diagram showing gradation luminance characteristics when viewed from the front in a conventional liquid crystal display device of MVA mode and gradation luminance characteristics when viewed from an azimuth angle of 90 degrees and a polar angle of 60 degrees;

3 is a plan view showing a liquid crystal display device according to the first embodiment of the present invention.

4 is a schematic cross-sectional view of a liquid crystal display device of the first embodiment.

Fig. 5 is a diagram showing the transmittance-applied voltage characteristics when viewed from the front of the liquid crystal display device of the first embodiment, and the transmittance-applied voltage characteristics when viewed from the inclined direction.

6 is a plan view showing a liquid crystal display device according to a second embodiment of the present invention.

7 is a plan view showing a liquid crystal display device according to a third embodiment of the present invention.

8 is a plan view illustrating a liquid crystal display device according to a fourth embodiment of the present invention.

9 is a plan view illustrating a liquid crystal display device according to a fifth embodiment of the present invention.

The schematic diagram which shows the orientation of the liquid crystal molecule in the liquid crystal display device of the conventional MVA system.

Fig. 11 is a plan view and a partially enlarged view of the liquid crystal display device of Example 1 of the sixth embodiment of the present invention.

12 is a plan view and a partially enlarged view of a liquid crystal display device of Example 2 of the sixth embodiment of the present invention.

Fig. 13 is a plan view showing a liquid crystal display device of Example 3 of Embodiment 6 of the present invention, and a partially enlarged view thereof.

14 is a plan view showing a liquid crystal display device according to a seventh embodiment of the present invention.

FIG. 15 is a sectional view taken along line I-I in FIG. 14; FIG.

16 is a diagram illustrating a relationship between a pixel capacity ratio and a voltage ratio.

FIG. 17 is a diagram showing transmittance characteristics and orientation characteristics in the liquid crystal display device of the seventh embodiment. FIG.

18 is a plan view illustrating a liquid crystal display device according to an eighth embodiment of the present invention.

Fig. 19 shows the transmittance characteristics and the orientation characteristics in the liquid crystal display device of the eighth embodiment.

20 is a plan view illustrating another example of the liquid crystal display device of the eighth embodiment.

21 is a plan view showing a liquid crystal display device according to a ninth embodiment of the present invention.

Fig. 22 shows the transmittance characteristics in the liquid crystal display device of the ninth embodiment.

23 (a) and 23 (b) show a state of transmission of light when voltage is applied in a liquid crystal display device (no black matrix) having a distance between the fine electrode portion and the data bus line of 7 μm or 5 μm. drawing.

24A and 24B show a state of light transmission when voltage is applied in a liquid crystal display (with a black matrix) in which the distance between the fine electrode portion and the data bus line is 7 μm or 5 μm. drawing.

25 (a) and 25 (b) show the results of investigating the transient characteristics of the liquid crystal display device from applying a voltage to the liquid crystal until the alignment is stabilized using a high speed camera.

Fig. 26 is a plan view showing a liquid crystal display device according to Example 1 of the tenth embodiment.

27 is a plan view showing a liquid crystal display device according to a second embodiment of the tenth embodiment.

Fig. 28 is a plan view showing a liquid crystal display device according to Example 3 of the tenth embodiment.

29 is a plan view showing a liquid crystal display device according to a fourth embodiment of the tenth embodiment.

30 is a diagram illustrating a relationship between a white display voltage, a direct pixel electrode ratio, and a gamma deviation amount;

Fig. 31 is a plan view showing a liquid crystal display device 1 according to an eleventh embodiment of the present invention.

32 is a plan view of a liquid crystal display device 2 according to an eleventh embodiment of the present invention.

Fig. 33 is a plan view showing a liquid crystal display device 3 of the eleventh embodiment of the present invention.

Fig. 34 is a plan view showing a liquid crystal display device 4 of the eleventh embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

1, 3, 121a to 121c, 152a, 152b, 162a, 162b, 172a to 172c, 182a to 182c, 321a to 321c, 351a, and 351b: subpixel electrode

2, 313a, 313c, 341: auxiliary capacitor lower electrode

4, 119a, 119c, 151a, 151c, 161a, 161c, 171, 313a, 313c, 319a, 319c, 345, 419a: control electrode

11, 112, 211, 312, 412: gate bus lines

12, 117, 177, 202, 212, 317, 417: data bus lines

14, 118, 214, 318, 418: TFT

15, 215, 421, 441, 451, 461: pixel electrodes

110, 310: TFT substrate

111, 131, 311, 331: glass substrate

113, 313, 413: auxiliary capacity bus lines

114, 120, 314, 320: insulating film

115, 315: semiconductor film

116, 316: channel shield

119b, 151b, 161b, 313b, 319b, 419c: storage capacitor electrode

122, 153, 163, 173, 183, 204, 215a, 322, 422a to 422k, 422m, 422, 452a to 452h, 462a to 462d: slits

130, 330: opposing substrate

132, 332: black matrix

133, 333: color filter

134 and 334 common electrode

140, 340: liquid crystal layer

141a, 141b: polarizer

201, 215b: fine electrode portion

205: connection electrode portion

511b: direct connection pixel electrode (subpixel electrode)

511a, 511c: Capacitively coupled pixel electrode (subpixel electrode)

[Patent Document 1] Japanese Patent Application Laid-Open No. 2003-149647

[Patent Document 2] Japanese Patent Application Laid-Open No. 11-95221

[Patent Document 3] Japanese Patent Application Laid-Open No. 8-36186

The present invention relates to a liquid crystal display device in a multi-domain vertical alignment (MVA) mode, and more particularly, to a liquid crystal display device in which a polymer for determining a direction in which liquid crystal molecules are inclined when a voltage is applied is formed.

Generally, a liquid crystal display device is comprised by the liquid crystal panel which encloses a liquid crystal between two board | substrates, and the polarizing plates arrange | positioned at both sides of a liquid crystal panel, respectively. Pixel electrodes are formed for each pixel on one substrate of the liquid crystal panel, and common electrodes common to each pixel are formed on the other substrate. When a voltage is applied between the pixel electrode and the common electrode, the alignment direction of the liquid crystal molecules changes in accordance with the voltage, and as a result, the amount of light passing through the liquid crystal panel and the polarizing plates on both sides thereof changes. By controlling the applied voltage for each pixel, a desired image can be displayed on the liquid crystal display device.

In the liquid crystal display device of the twisted nematic (TN) mode which is widely used conventionally, the liquid crystal molecule is twist-oriented between two board | substrates using the positive liquid crystal of dielectric anisotropy. However, the TN mode liquid crystal display device has a drawback that the viewing angle characteristic is not sufficient. That is, in the liquid crystal display device of the TN mode, when the liquid crystal panel is viewed in the oblique direction, the color tone and contrast are significantly deteriorated, and in extreme cases, the contrast is reversed.

As liquid crystal display devices having excellent viewing angle characteristics, liquid crystal displays in IPS (In-Plane Switching) mode and liquid crystal displays in MVA (Multi-domain Vertical Alignment) mode are known. In the IPS mode liquid crystal display device, linear pixel electrodes and common electrodes are alternately arranged on one substrate, and when a voltage is applied between these pixel electrodes and the common electrode, parallel to the substrate surface in accordance with the voltage. Within one plane, the orientation of the liquid crystal molecules changes.

However, although the liquid crystal display device of the IPS mode is excellent in the viewing angle characteristic, since the voltage is applied in a direction parallel to the substrate surface, the direction of the liquid crystal molecules above the pixel electrode and the common electrode cannot be controlled. Therefore, in the liquid crystal display of the IPS mode, there is a drawback that the actual aperture ratio is low, and the screen becomes dark when no strong backlight is used.

In the liquid crystal display of MVA mode, the pixel electrode is formed on one board | substrate, and the common electrode is formed on the other board | substrate. Moreover, in the liquid crystal display device of general MVA mode, weir-shaped protrusion which consists of a dielectric material which extends in diagonal direction is formed on the common electrode, and the slit parallel to a projection is provided in the pixel electrode.

In the MVA mode liquid crystal display, when no voltage is applied, the liquid crystal molecules are oriented in a direction perpendicular to the substrate surface, and when a voltage is applied between the pixel electrode and the common electrode, the liquid crystal molecules are at an angle corresponding to the voltage. Orient inclined. At this time, a plurality of regions (domains) in which the liquid crystal molecules are inclined in different directions are formed by the slits or the protrusions provided in the pixel electrodes. Thus, favorable viewing angle characteristics can be obtained by forming the some area | region in which the direction in which liquid crystal molecules are inclined in one pixel differs.

However, in the liquid crystal display device of the MVA mode described above, since the actual aperture ratio decreases due to the slit and the projections, the effective aperture ratio is lower than that of the TN mode liquid crystal display device, although not as much as that of the IPS mode liquid crystal display device. Is needed. Therefore, the liquid crystal display of this kind of MVA mode is hardly adopted in the notebook computer which requires low power consumption.

Japanese Laid-Open Patent Publication No. 2003-149647 discloses a liquid crystal display device of MVA mode developed to solve the above drawbacks. 1 is a plan view illustrating a liquid crystal display device of the MVA mode. 1, the area | region for 2 pixels is shown.

On one board | substrate which comprises a liquid crystal panel, the some gate bus line 11 extended in a horizontal direction (X-axis direction), and the some data bus line 12 extending in a vertical direction (Y-axis direction) are formed. It is. An insulating film (gate insulating film) is formed between these gate bus lines 11 and the data bus lines 12, and electrically separates the gate bus lines 11 and the data bus lines 12 from each other. The rectangular areas partitioned by these gate bus lines 11 and data bus lines 12 become pixel areas, respectively.

In each pixel region, a TFT (thin film transistor) 14 and a pixel electrode 15 are formed. As shown in FIG. 1, the TFT 14 uses a portion of the gate bus line 11 as a gate electrode, and a semiconductor film (not shown) is formed as an active layer of the TFT 14 above the gate electrode. It is. The drain electrode 14a and the source electrode 14b are connected to both sides of the semiconductor film in the Y-axis direction. The source electrode 14b of the TFT 14 is electrically connected to the data bus line 12, and the drain electrode 14a is electrically connected to the pixel electrode 15.

In addition, in this application, the electrode connected to a data bus line among two electrodes connected to the semiconductor film used as an active layer of TFT is called a source electrode, and the electrode connected to a pixel electrode is called a drain electrode.

The pixel electrode 15 is formed of a transparent conductor such as indium tin oxide (ITO), for example. The slit 15a is formed in this pixel electrode 15 so that the orientation direction of the liquid crystal molecule at the time of voltage application may become four directions. That is, the pixel electrode 15 is divided into four regions on the basis of the center line parallel to the X axis and the center line parallel to the Y axis. A plurality of slits 15a extending in the direction of 45 ° with respect to the X axis are formed in the first area (the area at the upper right), and in the second area (area at the upper left) with 135 ° with respect to the X axis. A plurality of slits 15a extending in the form of a plurality of slits 15a are formed, and a plurality of slits 15a extending in a direction of 225 ° with respect to the X axis are formed in the third region (the lower left region). In the lower right region), a plurality of slits 15a extending in the direction of 315 ° with respect to the X axis are formed. On this pixel electrode 15, a vertical alignment film (not shown) made of polyimide is formed.

On the other substrate, a black matrix, a color filter, and a common electrode are formed. The black matrix is made of, for example, a metal such as Cr (chrome) or a black resin, and is disposed at a position facing the gate bus line 11, the data bus line 12, and the TFT 14. There are three types of color filters, red, green, and blue, and one color filter is arranged for each pixel. The common electrode is made of a transparent conductor such as ITO, and is formed on a color filter. On this common electrode, a vertical alignment film made of polyimide is formed.

These two substrates are arranged to face each other with a spacer (not shown) interposed therebetween, and liquid crystals having negative dielectric anisotropy are enclosed therebetween to form a liquid crystal panel. Hereinafter, the board | substrate with which TFT was formed among the two board | substrates which comprise a liquid crystal panel is called TFT board | substrate, and the board | substrate arrange | positioned facing a TFT board | substrate is called an opposing board | substrate.

In the liquid crystal display device of the MVA mode shown in FIG. 1, when no voltage is applied to the pixel electrode 15, the liquid crystal molecules are aligned substantially perpendicular to the substrate surface. When voltage is applied to the pixel electrode 15, as shown schematically in FIG. 1, the liquid crystal molecules 10 are inclined in the direction in which the slit 15a extends, and the inclined direction of the liquid crystal molecules in one pixel. Four different regions (domains) are formed. As a result, leakage of light in the oblique direction is suppressed, and good viewing angle characteristics are secured.

By the way, in the liquid crystal display device of the MVA mode shown in FIG. 1, immediately after the voltage is applied to the pixel electrode 15, the liquid crystal molecules 10 are inclined toward the inside (direction toward the center of the pixel) or the outside ( The direction of inclination toward the outside of the pixel) is not determined. First, the direction in which the liquid crystal molecules 10 on the front end side (the data bus line 12 side) of the slit 15a are inclined is determined inward by the electric field at the end of the pixel electrode 15, and then the liquid crystal molecules ( The direction in which 10) is inclined propagates toward the center of the pixel. For this reason, it takes a long time until all the liquid crystal molecules 10 in one pixel are inclined in a predetermined direction, and there is a drawback that the response time becomes long.

In Japanese Patent Laid-Open No. 2003-149647, a liquid crystal containing a polymerization component (monomer) is enclosed between a pair of substrates, a voltage is applied between the pixel electrode and the common electrode to orient the liquid crystal in a predetermined direction. It is described to form a polymer in the liquid crystal layer by irradiating ultraviolet rays to polymerize the polymerization component. In the liquid crystal display device manufactured in this way, since the direction in which the liquid crystal molecules are inclined is determined by the polymer in the liquid crystal layer, all liquid crystal molecules in the pixel are inclined in a predetermined direction while applying a voltage between the pixel electrode and the common electrode. Starting to lose, the response time is significantly shortened.

Japanese Unexamined Patent Publication Nos. 11-95221 and 8-36186 also describe adding a polymerization component in a liquid crystal.

In general, in the liquid crystal display device in the vertical alignment (VA) mode, it is known that the gradation brightness characteristic when viewed from the front is different from the gradation brightness characteristic when viewed in the oblique direction, and the same also in the above-described liquid crystal display apparatus of the MVA mode. Has the drawbacks. Fig. 2 shows gradation in the horizontal axis, transmissivity in the vertical axis, gradation luminance characteristics when viewed from the front in the liquid crystal display device of the MVA mode, azimuth angle of 90 °, and polar angle of 60 ° in the direction (direction on the inclined upper side). It is a figure which shows the gradation brightness characteristic when it sees. In addition, in this application, the angle formed by the line formed by projecting the line of sight to the liquid crystal panel and the X axis of the liquid crystal panel is referred to as the azimuth angle, and the angle formed by the normal line and the line of sight of the liquid crystal panel is called polar angle. Is calling. In addition, in FIG. 2, black to white are divided into 256 gray levels. Each grayscale corresponds to a voltage applied to the pixel electrode, and the larger the value of the grayscale, the higher the voltage applied to the pixel electrode. In addition, in FIG. 2, the transmittance | permeability is shown by the relative value when the transmittance | permeability Twhite at the time of white display is set to one.

As can be seen from Fig. 2, in the conventional liquid crystal display of the MVA mode, the gray scale transmittance characteristic when viewed from the front side and the gray scale transmittance characteristic when viewed from the inclined direction are significantly different, so that a good display quality is seen when viewed from the front side. Although it can be obtained, there is a drawback that the display quality deteriorates when viewed in the oblique direction. In particular, as can be seen from Fig. 2, in the conventional liquid crystal display device of the MVA mode, the gradation transmittance characteristic when viewed in the inclined direction is undulating compared to the gradation transmittance characteristic when viewed from the front, and thus the luminance at the time of halftone display. The difference is small. For this reason, when viewed from the oblique direction, a phenomenon in which the image appears whiteish as compared with when viewed from the front side occurs, and display quality deteriorates. Moreover, since the refractive index anisotropy of a liquid crystal has wavelength dependence, a color may change when it sees from the front and when viewed from the diagonal direction.

In addition, the slit 15a of the pixel electrode 15 as shown in FIG. 1 is formed by the photolithography method. The slit 15a is formed by a photolithography method, and is caused by variations in the film thickness of the photoresist film and slight difference in exposure amount (shot nonuniformity) during stepper exposure. Slit width fluctuations occur. As a result, fluctuations occur in the optical characteristics of the pixels, which causes display unevenness. For example, when a halftone display is performed on the entire panel, a tile pattern may be seen.

In addition, it is desired to improve the substantial aperture ratio and further reduce the power consumption. Moreover, the improvement of a response characteristic is calculated | required further in recent liquid crystal display devices.

As mentioned above, the objective of this invention is providing the liquid crystal display device of MVA mode which is substantially high, is applicable to a notebook computer, and is favorable in display quality also when it sees from the diagonal direction.

Another object of the present invention is to provide a liquid crystal display device of the MVA mode which can further improve the substantial aperture ratio.

It is still another object of the present invention to provide a liquid crystal display device having an MVA mode having a good display quality while avoiding occurrence of display unevenness due to a photolithography process while being substantially applicable to a notebook computer having a high aperture ratio.

It is still another object of the present invention to provide a liquid crystal display device having an MVA mode having a substantially high aperture ratio and being applicable to a notebook computer and having good response characteristics.

The said subject is formed by superposing | polymerizing the 1st and 2nd board | substrate arrange | positioned mutually opposite, the liquid crystal of negative dielectric anisotropy enclosed between the said 1st and 2nd board | substrate, and the polymerization component added in the said liquid crystal, It has a polymer which determines the direction in which a liquid crystal molecule inclines at the time of voltage application, The said 1st board | substrate is comprised by a switching element, several strip | belt-shaped fine electrode part, and the connection electrode part which electrically connects these with each pixel, for every pixel. A second subpixel electrode constituted by a first subpixel electrode to be formed, a plurality of band-shaped fine electrode portions, and a connection electrode portion electrically connecting them to each other, and the first and second substrates are formed on the second substrate. A common electrode facing the subpixel electrode is formed, a first voltage is applied to the first subpixel electrode through the switching element, and the second subpixel electrode is less than the first voltage. A low second voltage is applied to the liquid crystal display device.

In the present invention, a voltage lower than that of the first subpixel electrode is applied to the second subpixel electrode. As described above, when there are a plurality of regions having different applied voltages in one pixel, the phenomenon of white out when the screen is viewed in the oblique direction is suppressed, and the display quality is improved.

The said subject is formed by superposing | polymerizing the 1st and 2nd board | substrate arrange | positioned mutually opposite, the liquid crystal of negative dielectric anisotropy enclosed between the said 1st and 2nd board | substrate, and the polymerization component added in the said liquid crystal, It has a polymer which determines the direction in which a liquid crystal molecule inclines at the time of voltage application, A said 1st board | substrate is comprised by a switching element, a some strip | belt-shaped fine electrode part, and the connection electrode part which electrically connects these with each pixel. The pixel electrode to be formed is formed, and the liquid crystal display device has a cutout in a portion of the distal end portion of the fine electrode portion that does not face the adjacent fine electrode portion.

The liquid crystal molecules between the fine electrode portion and the bus line are oriented in a direction different from the direction in which the fine electrode portion extends. For this reason, a dark part arises between a fine electrode part and a bus line, and it becomes a cause which reduces a substantial aperture ratio. By making the space | interval of a fine electrode part and a bus line small, the area | region which a dark part generate | occur | produces can be made small, and a substantial aperture ratio can be improved. In this case, however, the capacitance between the fine electrode portion and the bus line is increased, resulting in deterioration of display quality due to crosstalk.

By the way, the part which does not oppose the adjacent microelectrode among the front-end | tip parts of a microelectrode part does not contribute to orienting liquid crystal molecule in a predetermined direction, but becomes a factor which increases the parasitic capacitance between bus lines. Therefore, in this invention, notch is provided in the part which does not oppose the adjacent microelectrode among the front-end | tip parts of a microelectrode part. Thereby, substantial opening ratio can be improved, suppressing generation | occurrence | production of crosstalk.

The said subject is formed by superposing | polymerizing the 1st and 2nd board | substrate arrange | positioned mutually opposite, the liquid crystal of negative dielectric anisotropy enclosed between the said 1st and 2nd board | substrate, and the polymerization component added in the said liquid crystal, It has a polymer which determines the direction in which a liquid crystal molecule inclines at the time of voltage application, A said 1st board | substrate is comprised by a switching element, a some strip | belt-shaped fine electrode part, and the connection electrode part which electrically connects these with each pixel. The pixel electrode to be formed is formed, and the shape of the region between the fine electrode portions on the proximal side of the fine electrode portion is a shape that is linearly symmetric with respect to the centerline of the region between the fine electrode portions. do.

As described above, the shape of the region between the fine electrode portions on the proximal end of the fine electrode portion is formed to be linearly symmetrical with respect to the centerline of the region between the fine electrode portions, thereby between the fine electrode portions on the proximal end of the fine electrode portion. The liquid crystal molecules in the region of can be aligned in the direction in which the fine electrode portion extends. Thereby, generation | occurrence | production of a dark part is suppressed and a substantial opening ratio improves.

The said subject is formed by superposing | polymerizing the 1st and 2nd board | substrate arrange | positioned mutually opposite, the liquid crystal of negative dielectric anisotropy enclosed between the said 1st and 2nd board | substrate, and the polymerization component added in the said liquid crystal, It has a polymer which determines the direction in which a liquid crystal molecule inclines at the time of voltage application, A said 1st board | substrate is comprised by a switching element, a some strip | belt-shaped fine electrode part, and the connection electrode part which electrically connects these with each pixel. The pixel electrode to be formed is formed, and the shape of the region between the microelectrode portions on the proximal side of the microelectrode portion has a cutout at a portion not facing the adjacent microelectrode portion among the tip portions of the microelectrode portion. It solves with the liquid crystal display device characterized by the shape becoming line symmetry with respect to the center line of the area | region between.

In this invention, since the disturbance of the orientation of the liquid crystal molecule in the area | region between the microelectrode part of the base end side of a microelectrode part, and the area | region between the microelectrode part of the front end side of a microelectrode part is suppressed, a substantial opening ratio is further improved. Can be improved. As a result, the power consumption of the liquid crystal display device can be further reduced.

The above object is formed by polymerizing first and second substrates disposed to face each other, a liquid crystal encapsulated between the first and second substrates, and a polymerization component added in the liquid crystal, and at the time of voltage application A polymer that determines the direction in which the molecule is inclined, and on the first substrate, a gate bus line extending in one direction, a data bus line extending in a direction crossing the gate bus line, and the gate bus line in parallel A storage capacitor bus line, a switching element formed for each pixel region partitioned by the gate bus line and the data bus line, a plurality of strip-shaped fine electrode portions, and a connection electrode portion electrically connecting them to each other. And a plurality of domain control regions having different alignment directions of liquid crystal molecules and directly connected to the first switching element. And a plurality of domains disposed in the same pixel region as the first subpixel electrode, and constituted by a plurality of band-shaped fine electrode portions and a connecting electrode portion electrically connecting them to each other, and having different alignment directions of liquid crystal molecules. A second subpixel electrode having a control region, a storage capacitor electrode disposed at a position opposed to the storage capacitor bus line with a first insulating film interposed therebetween, and the first and second subpixels connected to the switching element. A control electrode disposed at a position opposite to a boundary of the domain control region of an electrode, the control electrode capacitively coupled to the second subpixel electrode through a second insulating film, and connected to the auxiliary capacitor bus line, And a storage capacitor lower electrode disposed at a position opposite to the control electrode, and having a second substrate facing the first and second subpixel electrodes. It is solved by a liquid crystal display device characterized in that electrodes are formed.

In the present invention, the control electrode and the storage capacitor lower electrode are disposed at positions opposite to the boundary of the domain control region of the first and second subpixel electrodes with the first insulating film interposed therebetween. This increases the capacitance value of the storage capacitors connected in parallel to the pixel electrodes, thereby improving the response characteristic.

The said subject is formed by superposing | polymerizing the 1st and 2nd board | substrate arrange | positioned mutually opposite, the liquid crystal of negative dielectric anisotropy enclosed between the said 1st and 2nd board | substrate, and the polymerization component added in the said liquid crystal, A pixel electrode having a polymer which determines a direction in which the liquid crystal molecules are inclined when voltage is applied, and a pixel electrode divided into a plurality of regions in which the switching element and the alignment direction of the liquid crystal molecules are different for each pixel are formed on the first substrate, and The pixel electrode is constituted by a plurality of band-shaped fine electrode portions formed in each region and a connection electrode portion electrically connecting them, and the width of the pixel edge portion of the fine electrode portion is wider than the width at the pixel center side. This is solved by the liquid crystal display device.

Thus, by making the width | variety of the pixel center side of a fine electrode part wider than the width | variety of a pixel edge part, generation | occurrence | production of the display unevenness resulting from a photolithography process can be avoided.

The said subject is formed by superposing | polymerizing the 1st and 2nd board | substrate arrange | positioned mutually opposite, the liquid crystal of negative dielectric anisotropy enclosed between the said 1st and 2nd board | substrate, and the polymerization component added in the said liquid crystal, First and second subpixels each having a polymer for determining a direction in which the liquid crystal molecules are inclined upon application of voltage, and each pixel includes a switching element and a plurality of regions having different alignment directions of the liquid crystal molecules from each pixel; An electrode is formed, and the first subpixel electrode is constituted by a plurality of band-shaped fine electrode portions extending in a predetermined direction for each region, and a connecting electrode portion electrically connecting them to each other, and directly connected to the switching element. The second subpixel electrode is formed by a plurality of band-shaped fine electrode portions extending in a predetermined direction for each region and a connection electrode portion electrically connecting them to each other. And a width of the fine electrode portion of the first subpixel electrode is wider than the width of the fine electrode portion of the second subpixel electrode. do.

Thus, the width | variety of the microelectrode part of the 1st subpixel electrode directly connected to the switching element is made larger than the width | variety of the microelectrode part of the 2nd subpixel electrode connected to the switching element through capacitive coupling, and it originates in the photolithography process. The occurrence of display spots can be avoided.

The said subject is formed by superposing | polymerizing the 1st and 2nd board | substrate arrange | positioned mutually opposite, the liquid crystal of negative dielectric anisotropy enclosed between the said 1st and 2nd board | substrate, and the polymerization component added in the said liquid crystal, First and second subpixels each having a polymer for determining a direction in which the liquid crystal molecules are inclined upon application of voltage, and each pixel includes a switching element and a plurality of regions having different alignment directions of the liquid crystal molecules from each pixel; An electrode is formed, and the said first subpixel electrode is comprised by the several strip | belt-shaped fine electrode part extended in a predetermined direction for each area | region, and the connection electrode part which electrically connects them, and is directly connected to the said switching element. The second subpixel electrode is formed by a plurality of band-shaped fine electrode portions extending in a predetermined direction for each region and connected electrode portions electrically connected to each other. And the area ratio of the first subpixel electrode to the total area of the first subpixel electrode and the second subpixel electrode is 10 to 70%. It solves by the liquid crystal display device made into.

By making the area ratio of the 1st subpixel electrode directly connected to a switching element into 10 to 70% of range, the phenomenon which becomes white light when a screen is seen from the diagonal direction can be suppressed.

Best Mode for Carrying Out the Invention

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described with reference to attached drawing.

(1st embodiment)

3 is a plan view of the liquid crystal display device according to the first embodiment of the present invention, and FIG. 4 is a schematic cross-sectional view of the liquid crystal display device. 3, the area | region for two pixels is shown.

As shown in FIG. 4, the liquid crystal panel 100 is constituted by a TFT substrate 110, a counter substrate 130, and a liquid crystal layer 140 made of a liquid crystal having negative dielectric anisotropy enclosed therebetween. It is. The polarizing plates 141a and 141b are arrange | positioned at the both sides of the thickness direction of this liquid crystal panel 100, respectively. The liquid crystal layer 140 contains a polymer formed by polymerizing a polymerization component (monomer or oligomer) added in a liquid crystal by ultraviolet irradiation.

As shown in FIG. 3, the TFT substrate 110 includes a plurality of gate bus lines 112 extending in the horizontal direction (X-axis direction) and a plurality of data bus lines extending in the vertical direction (Y-axis direction). 117 is formed. The rectangular regions partitioned by these gate bus lines 112 and data bus lines 117 are pixel regions, respectively. In the TFT substrate 110, a storage capacitor bus line 113 is disposed in parallel with the gate bus line 112 and crosses the center of the pixel region. In this embodiment, one of the polarizing plates 141a and 141b is disposed with its absorption axis parallel to the gate bus line 112, and the other is disposed with its absorption axis parallel to the data bus line 117.

In each pixel region, the TFT 118, three subpixel electrodes 121a to 121c, control electrodes 119a and 119c, and the storage capacitor electrode 119b are formed. The subpixel electrodes 121a to 121c are made of a transparent conductor such as ITO, and are provided with slits 122 which define the alignment directions of liquid crystal molecules at the time of voltage application, respectively.

Hereinafter, the structure of the TFT substrate 110 and the counter substrate 130 will be described in more detail with reference to the plan view of FIG. 3 and the schematic cross-sectional view of FIG. 4.

On the glass substrate 111 serving as the base of the TFT substrate 110, a gate bus line 112 and a storage capacitor bus line 113 are formed. These gate bus lines 112 and storage capacitor bus lines 113 are formed of, for example, a metal film formed by stacking Al (aluminum) -Ti (titanium).

On the gate bus line 112 and the storage capacitor bus line 113, a first insulating film (gate insulating film) 114 made of, for example, SiO ₂ or SiN is formed. In a predetermined region on the first insulating film 114, a semiconductor film (for example, an amorphous silicon film or a polysilicon film) 115 serving as an active layer of the TFT 118 is formed. On this semiconductor film 115, a channel protective film 116 made of SiN or the like is formed. On both sides of the channel protective film 116, drain electrodes 118a and source electrodes 118b of the TFT 118 are formed. have.

Further, on the first insulating film 114, the data bus line 117 connected to the source electrode 118b of the TFT 118, the control electrodes 119a and 119c connected to the drain electrode 118a, and the storage capacitor The electrode 119b is formed. As shown in FIG. 4, the storage capacitor electrode 119b is formed at a position facing the storage capacitor bus line 113 with the first insulating film 114 interposed therebetween. The storage capacitor is constituted by the storage capacitor bus line 113, the storage capacitor electrode 119b, and the first insulating film 114 therebetween. The control electrodes 119a and 119c are formed along the center line of the pixel region parallel to the Y axis, and the storage capacitor electrode 119b is formed along the centerline of the pixel region parallel to the X axis.

These data bus lines 117, the drain electrode 118a, the source electrode 118b, the control electrodes 119a and 119c and the storage capacitor electrode 119b are formed by laminating Ti / Al / Ti, for example. Is formed by.

On these data bus lines 117, the drain electrode 118a, the source electrode 118b, the control electrodes 119a and 119c and the storage capacitor electrode 119b, a second insulating film 120 made of, for example, SiN is formed. It is. Three subpixel electrodes 121a to 121c are formed on the second insulating film 120. As shown in FIG. 4, the subpixel electrode 121a is capacitively coupled to the control electrode 119a through the second insulating film 120, and the subpixel electrode 121c is controlled through the second insulating film 120. Capacitively coupled to electrode 119c. In addition, the subpixel electrode 121b is electrically connected to the storage capacitor electrode 119b through the contact hole 120a provided in the second insulating film 120.

As shown in FIG. 3, the subpixel electrode 121a is disposed above the pixel region, and is divided into two regions (domain control region) of right and left symmetry with a center line parallel to the Y axis. In the region on the right side, a plurality of slits 122 are formed that extend in the direction of about 45 ° with respect to the X axis, and in the region on the left side, the plurality of slits 122 that extend in the direction of about 135 ° with respect to the X axis are formed. Formed.

The subpixel electrode 121b is disposed in the center of the pixel region, and is divided into four regions (domain control regions) by a center line parallel to the X axis and a center line parallel to the Y axis. A plurality of slits 122 extending in a direction of about 45 ° with respect to the X axis are formed in the first area of the upper right side, and a plurality of slits 122 extending in a direction of about 135 ° with respect to the X axis are formed in the second area of the upper left part. Slits 122 are formed, a plurality of slits 122 extending in a direction of about 225 ° with respect to the X axis are formed in the third region on the lower left side, and a plurality of slits 122 are formed in the fourth region on the lower right side on the X axis. A plurality of slits 122 are formed that extend in the direction of approximately 315 degrees with respect to each other.

The subpixel electrode 121c is disposed below the pixel region, and is divided into two regions (domain control region) of right and left symmetry with a center line parallel to the Y axis. A plurality of slits 122 extending in a direction of about 225 degrees with respect to the X axis are formed in the region on the left side, and a plurality of slits extending in a direction of about 315 degrees with respect to the X axis in the region on the lower right side ( 122) is formed. The width of the slit 122 of each subpixel electrode 121a-121c is 3.5 micrometers, for example, and the space | interval between the slits (width of a fine electrode part) is 6 micrometers, for example.

In addition, in this specification, the strip | belt-shaped conductor part between a slit among a pixel electrode or a subpixel electrode is called a microelectrode part, and the part which electrically connects the base end side of a microelectrode part with each other is called a connection electrode part.

On these subpixel electrodes 121a to 121c, vertical alignment films (not shown) made of polyimide or the like are formed.

On the other hand, on one surface side (the lower side in FIG. 4) of the glass substrate 131 serving as the base of the opposing substrate 130, the black matrix (light shielding film) 132, the color filter 133, and the common electrode 134 are provided. Is formed.

 The black matrix 132 is disposed at positions facing the gate bus line 112, the data bus line 117, and the TFT 118 on the TFT substrate 110 side. There are three types of color filters 133, red, green, and blue, and color filters of any one color are arranged for each pixel region. One pixel is constituted by three pixels of an adjacent red pixel, a green pixel, and a blue pixel to enable display of various colors.

The common electrode 134 is formed of a transparent conductor such as ITO, and is disposed on the color filter 133 (lower side in FIG. 4). On this common electrode 134 (lower in FIG. 4), vertical alignment films (not shown) such as polyimide are formed.

In the liquid crystal display device of the present embodiment configured as described above, when the display signal is applied to the data bus line 117 and a predetermined voltage (scan signal) is applied to the gate bus line 112, the TFT 118 is turned on. The display signal is transmitted to the control electrodes 119a and 119c and the storage capacitor electrode 119b. Since the subpixel electrode 121b is connected to the storage capacitor electrode 119b through the contact hole 120a, the voltage of the subpixel electrode 121b is equal to the voltage of the display signal.

On the other hand, a voltage corresponding to the capacitance value between the control electrodes 119a and 119c is applied to the subpixel electrodes 121a and 121c. Here, the voltage of the display signal is V _D , and the capacitance value between the subpixel electrodes 121a and 121c and the counter electrode is C1, and the capacitance value between the subpixel electrodes 121a and 121c and the control electrodes 119a and 119c. When the by C2, the voltage V1 applied to the sub-pixel electrodes (121a, 121c) is, as is _{V1 = V D · C2 / (} C1 + C2).

That is, a voltage lower than that of the pixel electrode 121b is applied to the subpixel electrodes 121a and 121c, and two regions having different transmittance-applied voltage characteristics (T-V characteristics) exist in one pixel. The synthesis of the transmittance-applied voltage characteristics of each region becomes the overall transmittance-applied voltage characteristic. As described above, it is known that deterioration of display quality when the screen is viewed in the oblique direction is formed by forming a plurality of regions having different transmittance-applied voltage characteristics in one pixel.

In this embodiment, the threshold value of the transmittance | permeability-applied voltage characteristic in the area | region in which the subpixel electrode 121b (namely, the subpixel electrode connected to TFT without capacitive coupling: hereafter called a direct pixel electrode) is arrange | positioned. And the threshold value of the transmittance-applied voltage characteristic in a region where subpixel electrodes 121a and 121c (subpixel electrodes connected to TFTs via capacitive coupling: hereinafter referred to as capacitively coupled pixel electrodes) are arranged. Set the capacitance values C1 and C2 to 1V. In addition, in this embodiment, the ratio of the area of the area | region where the subpixel electrode 121b (direct pixel electrode) is arrange | positioned, and the area of the area | region where subpixel electrodes 121a and 121c (capacitive coupling pixel electrode) are arrange | positioned, 4: 6. What is necessary is just to set these capacitance values C1, C2 value, and area ratio suitably according to the desired gradation brightness characteristic.

Fig. 5 shows the transmittance-applied voltage characteristics when viewed from the front of the liquid crystal display device (example) of the present embodiment by taking a gray scale on the horizontal axis, and a transmissivity on the vertical axis, and the transmittance-applied voltage when viewed in an inclined direction. It is a figure which shows a characteristic. 5, the transmittance | permeability-applied voltage characteristic as seen from the inclination direction of the conventional liquid crystal display device of the structure shown in FIG. 1 is shown. As can be seen from FIG. 5, the liquid crystal display device of the present embodiment has a smaller undulation of the transmittance-applied voltage characteristic when viewed in the inclined direction than that of the conventional liquid crystal display device. From this, it turns out that the display quality when it sees from the inclination direction is improved compared with the liquid crystal display device of the prior art example shown in FIG.

Further, when voltage is applied in the boundary portion of each region in which the slit 122 extends different from each other, that is, in the region along the centerline of the pixel region parallel to the X axis and in the region along the centerline of the pixel region parallel to the Y axis. Since the liquid crystal molecules are oriented in a direction parallel to the X axis or the Y axis (that is, a direction parallel or orthogonal to the absorption axes of the polarizing plates 141a and 141b), light does not transmit. In this embodiment, since the control electrodes 119a and 119c and the storage capacitor electrode 119b are provided in this boundary part, the aperture ratio by providing the control electrodes 119a and 119c and the storage capacitor electrode 119b is The fall can be minimized.

Hereinafter, the manufacturing method of the liquid crystal display device of this embodiment is demonstrated.

First, the glass substrate 111 used as the base of the TFT substrate 110 is prepared. Then, a metal film formed by laminating, for example, Al (aluminum) / Ti (titanium) on the glass substrate 111 is formed, and the metal film is patterned by a photolithography method to form a gate bus line 112, Auxiliary capacitance bus line 113 is formed. In this case, for example, the gate bus lines 112 are formed at a pitch of about 300 mu m in the vertical direction.

Next, a first insulating film (gate insulating film) 114 formed of an insulator such as SiO ₂ or SiN is formed on the entire upper surface of the glass substrate 111. Then, a semiconductor film (amorphous silicon film or polysilicon film) 115 serving as an active layer of the TFT 118 is formed in a predetermined region on the first insulating film 114.

Next, an SiN film is formed on the entire upper surface of the glass substrate 111, and the SiN film is patterned by the photolithography method to form the channel protective film 116 on the region serving as the channel of the semiconductor film 115. Next, as shown in FIG.

Next, an ohmic contact layer (not shown) made of a semiconducting body film in which impurities are introduced at a high concentration is formed on the entire upper surface of the glass substrate 111. Thereafter, a metal film formed by stacking Ti / Al / Ti in this order, for example, on the glass substrate 111 is formed, and the metal film and the ohmic contact layer are patterned by a photolithography method to form a data bus line ( 117, the drain electrode 118a, the source electrode 118b, the control electrodes 119a and 119c, and the storage capacitor electrode 119b are formed. In this case, for example, the data bus lines 117 are formed at a pitch of about 100 mu m in the horizontal direction.

Next, a second insulating film 120 made of an insulator such as SiO ₂ or SiN is formed on the entire upper surface of the glass substrate 111. In this second insulating film 120, a contact hole 120a reaching the storage capacitor electrode 119b is formed.

Next, ITO is sputtered on the upper whole surface of the glass substrate 111, and an ITO film is formed. The ITO film is electrically connected to the storage capacitor electrode 119b through the contact hole 120a. Thereafter, the ITO film is patterned by the photolithography method to form the subpixel electrodes 121a to 121c. In these subpixel electrodes 121a to 121c, slits 122 extending in the oblique direction are formed as described above.

Then, polyimide is apply | coated to the upper whole surface of the glass substrate 111, and an orientation film is formed. In this way, the TFT substrate 110 is completed.

Next, the manufacturing method of the opposing board | substrate 130 is demonstrated.

First, the glass substrate 131 used as the base of the opposing substrate 130 is prepared. The black matrix 132 is formed of Cr (chrome) or black resin on a predetermined region of the glass substrate 131. This black matrix 132 is formed at a position facing the gate bus line 112 and the source bus line 117 on the TFT substrate 110 side, for example.

Next, red, green, and blue color filters 133 are formed on the glass substrate 131 using red photosensitive resin, green photosensitive resin, and blue photosensitive resin.

Subsequently, the common electrode 134 is formed by sputtering ITO on the entire upper surface of the glass substrate 131, and then an polyimide is applied on the common electrode 134 to form an alignment film. In this way, the opposing substrate 130 is completed.

The TFT substrate 110 and the opposing substrate 130 manufactured in this way are disposed to face each other, and a liquid crystal having negative dielectric anisotropy is enclosed therebetween to be a liquid crystal panel 100. In the liquid crystal, 0.3 wt% of a polymerization component (such as diacrylate or methacrylate) having, for example, a photofunctional group, is previously added to the liquid crystal. The gap (cell gap) between the TFT substrate 110 and the counter substrate 130 is set to 3.5 to 4 µm, for example.

Subsequently, a predetermined signal is applied to the gate bus line 112 to turn on the TFT 118 of each pixel, and a predetermined voltage is applied to the data bus line 117. As a result, a voltage is applied between the subpixel electrodes 121a to 121c and the common electrode 134, and the liquid crystal molecules in the pixel are aligned in a predetermined direction. After the orientation of the liquid crystal molecules is sufficiently stabilized, ultraviolet rays are irradiated to polymerize monomers in the liquid crystal. In this way, the direction in which the liquid crystal molecules are tilted when the voltage is applied is determined by the polymer formed in the liquid crystal layer.

Thereafter, polarizing plates 141a and 141b are disposed on both sides of the liquid crystal panel 100 in the thickness direction, and a driving circuit and a backlight are attached. In this way, the liquid crystal display device of the present embodiment is completed.

(2nd embodiment)

It is a top view which shows the liquid crystal display device of 2nd Embodiment of this invention. 6, the same code | symbol is attached | subjected to the same thing as FIG. 3, and the detailed description is abbreviate | omitted.

In this embodiment, two subpixel electrodes 152a and 152b are formed in one pixel region. The subpixel electrode 152a (directly connected pixel electrode) is disposed in an upper region in the pixel region, and is divided into four regions (domain control regions) by a center line parallel to the X axis and a center line parallel to the Y axis. . A plurality of slits 153 extending in a direction of about 45 ° with respect to the X axis are formed in the first region in the upper right corner, and a plurality of slits 153 extending in a direction of about 135 ° with respect to the X axis in the second region in the upper left corner. Slits 153 are formed, and a plurality of slits 153 extending in a direction of about 225 ° with respect to the X axis are formed in the third region on the lower left side, and a plurality of slits 153 are formed on the X axis on the fourth region on the lower right side. A plurality of slits 153 extending in a direction of approximately 315 degrees with respect to the plurality are formed.

The subpixel electrode 152b (capacitively coupled pixel electrode) is disposed in the lower region in the pixel region. The area of the subpixel electrode 152b is larger than that of the subpixel electrode 152a, and like the subpixel electrode 152a, it is divided into four regions (domain control regions) by a centerline parallel to the X axis and a centerline parallel to the Y axis. It is divided. A plurality of slits 153 extending in the direction of about 45 ° with respect to the X axis are formed in the first region of the upper right side, and extending in the direction of about 135 ° with respect to the X axis in the second region of the upper left side. A plurality of slits 153 are formed, a plurality of slits 153 extending in a direction of approximately 225 ° with respect to the X axis are formed in the third region on the lower left side, and X is formed in the fourth region on the lower right side. A plurality of slits 153 extending in the direction of approximately 315 ° with respect to the axis are formed.

Below the subpixel electrodes 152a and 152b, control electrodes 151a extending along the center line of the pixel region parallel to the Y axis are formed. This control electrode 151a is electrically connected to the drain electrode of the TFT 118.

Further, under the subpixel electrode 152a, a storage capacitor bus line 113 and a storage capacitor electrode 151b are formed along the center line of the subpixel electrode 152a parallel to the X axis. The storage capacitor bus line 113 is formed on the same layer (layer) as the gate bus line 112. The storage capacitor electrode 151b is formed on the same layer as the control electrode 151a and is connected to the control electrode 151a. A first insulating film (corresponding to the insulating film 114 in FIG. 4) is formed between the storage capacitor bus line 113 and the storage capacitor electrode 151b. The first insulating film, the storage capacitor bus line 113, and the storage capacitor are formed. The storage capacitor is constituted by the electrode 151b. The storage capacitor electrode 151b is electrically connected to the subpixel electrode 152a through a contact hole 154 formed in the second insulating film (corresponding to the insulating film 120 of FIG. 4).

Further, a control electrode 151c is formed below the subpixel electrode 152b along the centerline of the subpixel electrode 152b parallel to the X axis. This control electrode 151c is also formed in the same layer (layer) as the control electrode 151a, and is electrically connected to the control electrode 151a. The control electrode 151c is capacitively coupled to the subpixel electrode 152b through the second insulating film.

Since the structure of the opposing substrate is basically the same as in the first embodiment, the description is omitted here. Moreover, also in this embodiment, the liquid crystal which added the polymerization component, such as a diacrylate, was enclosed between TFT board | substrate and an opposing board | substrate, and a voltage is applied between pixel electrode (subpixel electrode 152a, 152b) and a common electrode. After aligning the liquid crystal molecules in a predetermined direction, ultraviolet rays are irradiated to polymerize the polymerized component to form a polymer in the liquid crystal layer.

Also in this embodiment, since two regions having different transmittance-applied voltage characteristics are provided in one pixel as in the first embodiment, the display quality can be avoided when the screen is viewed in the oblique direction. do.

In this embodiment, the storage capacitor bus line 113 and the storage capacitor electrode 151b are formed along the center line of the subpixel electrode 152a parallel to the X axis. This part is a part of the domain boundary, and since the liquid crystal molecules are inclined in a direction parallel to the X axis when voltage is applied, even if there is no storage capacitor bus line 113 and storage capacitor electrode 151b, Light does not transmit. Therefore, a decrease in transmittance due to the formation of the storage capacitor bus line 113 and the storage capacitor electrode 151b is avoided. Moreover, in this embodiment, it is possible to adjust the capacitance value of the storage capacitor by adjusting the length and width of the storage capacitor electrode 151b, which also has the advantage of having a high degree of freedom in designing the capacitance value of the storage capacitor.

Similarly to this, since the control electrode 151c is formed along the centerline of the subpixel electrode 152b parallel to the X axis, a decrease in transmittance due to the formation of the control electrode 151c is avoided. Moreover, by adjusting the length and width of the control electrode 151c, it is possible to adjust the coupling capacitance value between the control electrodes 151a and 151c and the subpixel electrode 152b, so that the design freedom of the coupling capacitance value can be adjusted. There is also an advantage of being high.

(Third embodiment)

It is a top view which shows the liquid crystal display device of 3rd Embodiment of this invention. In FIG. 7, the same code | symbol is attached | subjected to the same thing as FIG. 3, and the detailed description is abbreviate | omitted.

Also in this embodiment, two subpixel electrodes 162a and 162b are formed in one pixel region. The subpixel electrode 162a (direct pixel electrode) is disposed in an upper region in the pixel region, and is divided into four regions (domain control regions) by a center line parallel to the X axis and a center line parallel to the Y axis. . A plurality of slits 163 extending in a direction of about 45 ° with respect to the X axis are formed in the first area of the upper right side, and a plurality of slits 163 extending in a direction of about 135 ° with respect to the X axis in the second area of the upper left part. Slits 163 are formed, a plurality of slits 163 extending in a direction of about 225 ° with respect to the X axis are formed in the third region on the lower left side, and a plurality of slits 163 are formed on the X axis on the fourth region on the lower right side. A plurality of slits 163 extending in a direction of approximately 315 degrees with respect to the plurality are formed.

The subpixel electrode 162b (capacitively coupled pixel electrode) is disposed in the lower region in the pixel region. The area of the subpixel electrode 162b is larger than that of the subpixel electrode 162a, and similarly to the subpixel electrode 162a, it is divided into four regions (domain control regions) by a centerline parallel to the X axis and a centerline parallel to the Y axis. It is divided. A plurality of slits 163 extending in a direction of approximately 315 ° with respect to the X axis are formed in the first region of the upper right side, and extending in a direction of approximately 225 ° with respect to the X axis in the second region of the upper left side. A plurality of slits 163 are formed, and a plurality of slits 163 extending in a direction of approximately 135 ° with respect to the X axis are formed in the third region on the lower left side, and X is formed in the fourth region on the lower right side. A plurality of slits 163 extending in the direction of approximately 45 ° with respect to the axis are formed.

Under the subpixel electrodes 162a and 162b, the control electrode 161a is formed along the center line of the pixel region parallel to the Y axis. This control electrode 161a is electrically connected to the drain electrode 118a of the TFT 118.

Further, under the subpixel electrode 162a, a storage capacitor bus line 113 and a storage capacitor electrode 161b are formed along the centerline of the subpixel electrode 162a parallel to the X axis. The storage capacitor bus line 113 is formed on the same layer as the gate bus line 112. The storage capacitor electrode 161b is formed on the same layer as the control electrode 161a and is electrically connected to the control electrode 161a. A first insulating film (corresponding to the insulating film 114 in FIG. 4) is formed between the storage capacitor bus line 113 and the storage capacitor electrode 161b, and the storage capacitor bus line 113, the storage capacitor electrode 161b, and The storage capacitor is constituted by the first insulating film therebetween. The storage capacitor electrode 161b is electrically connected to the subpixel electrode 162a through a contact hole 164 formed in the second insulating film (corresponding to the insulating film 120 of FIG. 4).

Further, a control electrode 161c is formed below the end of the subpixel electrode 162b. This control electrode 161c is also formed in the same layer as the control electrode 161a, and is electrically connected to the control electrode 161a. The control electrode 161c is capacitively coupled to the subpixel electrode 162b through the second insulating film.

Also in this embodiment, since the structure of a opposing board | substrate is basically the same as 1st Embodiment, description of a opposing board | substrate is abbreviate | omitted here. Also in this embodiment, a liquid crystal containing a polymerization component such as diacrylate is sealed between the TFT substrate and the counter substrate, and a voltage is applied between the pixel electrodes (subpixel electrodes 162a and 162b) and the common electrode. After aligning the liquid crystal molecules in a predetermined direction, ultraviolet rays are irradiated to polymerize the polymerization component.

In the above-described second embodiment (see FIG. 6), since the liquid crystal molecules between the subpixel electrode 152a and the subpixel electrode 152b are inclined in a direction parallel to the X axis when voltage is applied, the subpixel electrode 152a ) And a subpixel electrode 152b generate a dark line. On the other hand, in the present embodiment, since the gap between the two subpixel electrodes 162a and 162b extends in the same direction as the slit 163 in the vicinity thereof, the liquid crystal molecules between the subpixel electrodes 162a and 162b Inclined in the same direction as the slit 163 at the time of voltage application. Thereby, a dark line does not generate | occur | produce between subpixel electrodes 162a and 162b, and a substantial opening ratio improves.

In addition, also in this embodiment, since two regions having different transmittance-applied voltage characteristics are provided in one pixel as in the first embodiment, deterioration of display quality when the screen is viewed from the oblique direction is avoided. It is effective.

(4th embodiment)

8 is a plan view illustrating a liquid crystal display device according to a fourth embodiment of the present invention.

In this embodiment, as shown in FIG. 8, the data bus line 177 is formed in a zigzag shape that is bent in a direction of approximately 45 ° or 315 ° with respect to the X axis. However, the gate bus line 122 is formed in parallel with the X axis similarly to the first to third embodiments.

Three subpixel electrodes 172a, 172b, and 172c and a TFT 118 are formed for each pixel region partitioned by these gate bus lines 122 and data bus lines 177. Also in the present embodiment, the TFT 118 uses a portion of the gate bus line 122 as a gate electrode, and the drain electrode 118b and the source electrode 118a face each other with the gate bus line 122 interposed therebetween. It is arranged toward. Below the subpixel electrodes 172a to 172c, a control electrode 171 that is curved along the centerline of the pixel region is formed. The control electrode 171 is formed on the first insulating film (corresponding to the insulating film 114 in FIG. 3) and is electrically connected to the drain electrode 118b of the TFT 118.

The subpixel electrode 172a (capacitively coupled pixel electrode) is divided into two regions (domain control regions) by the center line. A slit 173 extending in the direction of approximately 315 degrees with respect to the X axis is provided in the region on the right side, and a slit 173 extending in the direction of approximately 135 degrees with respect to the X axis is provided in the region on the left side. have.

The subpixel electrode 172b (directly connected pixel electrode) is disposed at a curved portion in the center of the pixel region, and includes a first region in which a slit 173 is formed that extends in a direction of approximately 45 ° with respect to the X axis, and X A second region in which the slit 173 is formed extending in the direction of approximately 135 ° with respect to the axis, a third region in which the slit 173 is extending in the direction of approximately 225 ° with respect to the X axis, and approximately in the X axis The slits 173 extending in the direction of 315 ° are divided into a fourth region in which the slits 173 are formed. The subpixel electrode 172b is electrically connected to the control electrode 171 through a contact hole 174 provided in the second insulating film (corresponding to the insulating film 120 in FIG. 3).

The subpixel electrode 172c (capacitively coupled pixel electrode) is divided into two regions (domain control regions) by the center line. A slit 173 extending in a direction of about 45 ° with respect to the X axis is provided in the region on the right side, and a slit 173 extending in a direction of about 225 ° with respect to the X axis is provided in the region on the left side. have. The subpixel electrodes 172a and 172c are capacitively coupled to the control electrode 171 through the second insulating film.

Also in this embodiment, since the structure of a opposing board | substrate is basically the same as 1st Embodiment, description of a opposing board | substrate is abbreviate | omitted here. Moreover, also in this embodiment, the liquid crystal which added the polymerization component, such as a diacrylate, was enclosed between TFT board | substrate and an opposing board | substrate, and a voltage is applied between pixel electrode (subpixel electrodes 172a-172c) and a common electrode. After aligning the liquid crystal molecules in a predetermined direction, ultraviolet rays are irradiated to polymerize the polymerization component.

In the first to third embodiments, the slits of the subpixel electrodes extend in the directions of 45 °, 135 °, 225 ° and 315 ° with respect to the X axis, and the liquid crystal molecules are inclined in the same direction as the slits. However, since the line of electric force is generated outward at the end of the subpixel electrode, the liquid crystal molecules between the subpixel electrode and the data bus line are inclined in a direction parallel to the X axis. On the other hand, one of the two polarizing plates sandwiching a liquid crystal panel arranges the absorption axis in parallel with the X axis, and the other arranges the absorption axis in parallel with the Y axis. In this case, in the liquid crystal display devices of the first to third embodiments, a dark portion is generated between the subpixel electrode and the data bus line, so that the actual aperture ratio decreases.

Therefore, in this embodiment, as shown in FIG. 8, the data bus line 177 is extended in advance in the direction of approximately 45 degrees or 315 degrees with respect to the gate bus line 122, and sub-pixel electrodes at the time of voltage application The liquid crystal molecules between 172a to 172c and the data bus line 177 are inclined in the direction of 45 ° with respect to the polarization axis of the polarizing plate. Therefore, the dark portion does not occur between the subpixel electrodes 172a to 172c and the data bus line 177, and the actual aperture ratio is improved as compared with the first to third embodiments, whereby brighter display is possible. It is effective. In fact, when the liquid crystal display device according to the present embodiment was manufactured and its transmittance was examined, the transmittance was improved by about 5% compared to the liquid crystal display device having the structure shown in FIG. 3.

Also in the liquid crystal display device of the present embodiment, since a plurality of regions having different transmittance-applied voltage characteristics are formed in one pixel, an effect of improving the display quality when the screen is viewed in the oblique direction is obtained.

(5th embodiment)

9 is a plan view illustrating a liquid crystal display device according to a fifth embodiment of the present invention. This embodiment differs from the fourth embodiment in that the subpixel electrode has a different shape, and the rest of the structure is the same as that of the fourth embodiment. Detailed description will be omitted.

In the liquid crystal display device of the fourth embodiment shown in FIG. 8, many slits 173 are formed in the subpixel electrodes 172a to 172c. These slits 173 are formed by the photolithography method. That is, it is formed by applying a photoresist on the ITO films serving as the subpixel electrodes 172a to 172c, then performing stepper exposure, followed by developing, and etching the ITO film using the remaining photoresist film as a mask. . However, since the slit 173 is fine, the slit width fluctuates due to variations in the film thickness of the photoresist film or a slight difference in the exposure amount during the stepper exposure (shot nonuniformity), which affects the optical properties. The deterioration of the quality is considered.

Therefore, in the fifth embodiment, the slits 183 are formed only at the ends and the bent portions of the subpixel electrodes 182a to 182c (corresponding to the subpixel electrodes 172a to 172c of the fourth embodiment). When the liquid crystal display device of this embodiment superposes | polymerizes the polymerization component (monomer) added in the liquid crystal, time until a liquid crystal molecule orientates in a predetermined direction after applying a voltage compared with the liquid crystal display device of 4th embodiment. This lengthens. However, since the orientation direction of liquid crystal molecules is determined by the polymer in a liquid crystal layer at the time of actual use, the response characteristic equivalent to the liquid crystal display device of 4th Embodiment is obtained.

(6th Embodiment)

EMBODIMENT OF THE INVENTION Hereinafter, 6th Embodiment of this invention is described.

As described above, in the liquid crystal display device shown in FIG. 1, fluctuation in the slit width occurs due to the photolithography process, and when the halftone display is performed, a tile pattern may be seen. The present inventors conducted various experiments and studies in order to solve such a problem. As a result, when the thickness (cell gap) of the liquid crystal layer is d, the width of the conductor portion (that is, the fine electrode portion) between the slits is L and the slit width is S, d, L and By setting the value of S, knowledge has been obtained that the display unevenness caused by the photolithography process can be prevented.

For example, the thickness d of the liquid crystal layer may be 4 µm, the width L of the fine electrode portion may be 6 µm, and the slit width S may be 3.5 µm.

In fact, when the liquid crystal display device was manufactured under the above conditions, it was confirmed that generation of a tile-shaped pattern could be prevented. However, a new problem arises such that the luminance at the time of white display is lowered. This is considered to be for the following reasons.

When a voltage is applied between the pixel electrode and the common electrode, the liquid crystal molecules (liquid crystal molecules with negative dielectric anisotropy) tend to tilt in a direction orthogonal to the electric field lines generated from the pixel electrodes. As shown in FIG. 10, the liquid crystal molecules 203 on the tip side (the data bus line 202 side) of the fine electrode portion 201 are inclined toward the center of the pixel at the same time as the voltage is applied. Moreover, on the slit 204 and the fine electrode part 201, the liquid crystal molecules 203 which try to incline in the opposite direction collide with each other, and finally, the influence of the liquid crystal molecules 203 at the tip end of the fine electrode part 201. In response, these liquid crystal molecules 203 are inclined in the direction in which the slit 204 extends.

However, since the liquid crystal molecules 203 between the tip end of the fine electrode portion 201 and the data bus line 202 are inclined in a direction substantially perpendicular to the data bus line 202 at the time of voltage application, a dark portion is formed at this portion. Occurs. If the width of the fine electrode portion 201 is wide (for example, 6 mu m), the area to be a dark portion increases, so that the luminance decreases.

In order to reduce the area used as the dark portion, it is considered to extend the fine electrode portion 201 to reduce the distance between the fine electrode portion 201 and the data bus line 202. However, simply reducing the distance between the fine electrode portion 201 and the data bus line 202 increases the parasitic capacitance between the fine electrode portion 201 and the data bus line 202, resulting in crosstalk. This causes deterioration of the display quality. In other words, the improvement in luminance and the suppression of crosstalk are in a trade-off relationship.

The inventors of the present application observed the alignment state of liquid crystal molecules in a liquid crystal display device having a pixel electrode of the shape shown in FIG. 10 in detail. As a result, the liquid crystal molecules 203 are substantially perpendicular to the data bus line 202 in the portion of the tip portion of the fine electrode portion 201 without the opposing fine electrode portion 201 (a portion indicated by A in FIG. 10). It turned out to be inclined. Since the tip portion of the fine electrode portion 201 is close to the data bus line 202, it is a factor that increases the parasitic capacitance.

Therefore, in the present embodiment, as shown in FIG. 11, the gap between the fine electrode portion 215b and the data bus line 212 is reduced, and liquid crystal molecules are used as the tip portion of the fine electrode portion 215b. Cutouts are provided in portions not contributing to the orientation in the direction of the slit 215a, that is, portions having no opposing fine electrode portions (circled in FIG. 11), thereby avoiding an increase in parasitic capacitance. As a result, the transmittance at the time of white display is improved to enable power saving, and deterioration of display quality is avoided.

In Fig. 11, reference numeral 211 denotes a gate bus line, reference numeral 212 denotes a data bus line, reference numeral 214 denotes a TFT, and reference numeral 215 denotes a pixel electrode. In addition, the dashed-dotted line in the enlarged view of FIG. 11 has shown the front-end | tip position of the fine electrode part in the conventional liquid crystal display device of MVA mode.

In the photolithography process, it is very difficult for the tip to form an acute angle fine electrode portion, so that the tip of the fine electrode portion usually has a rounded shape. In addition, variation in the degree of rounding occurs due to a change in the slight conditions in the photolithography process, which causes variation in the optical characteristics. For this reason, at the time of design, it is preferable to make the tip shape of a fine electrode part into the arc shape or polygon shape of predetermined curvature.

Moreover, the inventors of the present application further observed the alignment state of the liquid crystal molecules in the liquid crystal display device having the pixel electrode of the shape shown in FIG. 10, and as a result, the base end portion (the portion indicated by B in FIG. 10) of the slit 204 was observed. In the vicinity, since the liquid crystal molecules 203 are not inclined in the 45 ° direction, it has been found that the white luminance is a cause of deterioration. This is considered to be based on the following reasons.

An intersection of the pixel electrode (a part connecting each microelectrode part: that is, the connection electrode 205) is formed in parallel with the gate bus line 202. The liquid crystal molecules 203 in the region B sandwiched between the connection electrode 205 and the fine electrode portion 201 are inclined in a direction orthogonal to the electric force lines generated from the connection electrode 205 and the fine electrode portion 201. It is inclined and inclined in the direction which balances both finally, ie, the direction which divides the angle which the connection electrode 205 and the fine electrode part 201 make into 2 parts. Since this direction is shifted from the direction in which the slit 204 extends, the transmittance | permeability at the time of white display becomes low.

Therefore, in this embodiment, the shape of the base end part of a slit is made into the shape which becomes line symmetry with respect to the centerline of a slit. Specifically, for example, as shown in FIG. 12, the shape of the proximal end side of the slit 215a is rectangular or as an isosceles triangle as shown in FIG. 13. As a result, the liquid crystal molecules 203 at the proximal end of the slit 215a are inclined in the direction of the center line of the slit 215a, thereby improving the luminance.

Hereinafter, the result of having actually manufactured the liquid crystal display device of this embodiment and examining the characteristic is demonstrated compared with a comparative example. In addition, in the liquid crystal display device of these Example and a comparative example, the structure of a counter substrate is the same as that of the liquid crystal display device of 1st Embodiment. Further, between the TFT substrate and the counter substrate, a liquid crystal (a liquid crystal having a negative dielectric anisotropy) containing diacrylate is encapsulated, and thereafter, ultraviolet rays are irradiated in a state where a predetermined voltage is applied between the pixel electrode and the common electrode. The polymer is formed in the liquid crystal layer. Moreover, the polarizing plates are arrange | positioned at both sides of a liquid crystal panel, respectively.

(Comparative Example 1)

The liquid crystal display device which has the pixel electrode as shown in FIG. 1 was manufactured. Thickness d of the liquid crystal layer of the liquid crystal display device of this comparative example 1 is 3.8 micrometers, width L of a fine electrode part is 3 micrometers, and slit width S is 3.5 micrometers. The value of L + d-S is 3.3 占 퐉 and does not satisfy the above equation (1). When halftones were displayed on the entire surface of the liquid crystal display of Comparative Example 1, a tile-like pattern was observed.

(Comparative Example 2)

The liquid crystal display device which has the pixel electrode as shown in FIG. 1 was manufactured. The thickness d of the liquid crystal layer of the liquid crystal display device of Comparative Example 2 is 4 μm, the width L of the fine electrode portion is 3 μm, and the slit width S is 3.5 μm. The value of L + d-S is 3.5 占 퐉 and does not satisfy the above equation (1). When a halftone was displayed on the entire surface of the liquid crystal display of Comparative Example 2, a tile-shaped pattern was observed.

(Comparative Example 3)

The liquid crystal display device which has the pixel electrode as shown in FIG. 1 was manufactured. Thickness d of the liquid crystal layer of the liquid crystal display device of this comparative example 3 is 4 micrometers, width L of a fine electrode part is 6 micrometers, and slit width S is 3.5 micrometers. The value of L + d-S is 6.5 µm, which satisfies the above expression (1). When the halftones were displayed on the entire surface of the liquid crystal display of Comparative Example 3, no tile-like pattern was observed. However, when the brightness | luminance at the time of the back display of this liquid crystal display device was measured, it turned out that it is about 10% falling compared with the liquid crystal display device of the comparative example 2.

Example 1

The liquid crystal display device which has the pixel electrode as shown in FIG. 11 was manufactured. The thickness d of the liquid crystal layer of the liquid crystal display device of Example 1 is 4 µm, the width L of the fine electrode portion is 6 µm, and the slit width S is 3 µm. The value of L + d-S is 7 µm, which satisfies the above expression (1). When halftones were displayed on the entire surface of the liquid crystal display of Example 1, no tile-like pattern was observed. Moreover, when the brightness | luminance at the time of the back display of this liquid crystal display device was measured, it turned out that it is improving about 7% compared with the liquid crystal display device of the comparative example 3.

Example 2

The liquid crystal display device which has the pixel electrode as shown in FIG. 12 was manufactured. Thickness d of the liquid crystal layer of the liquid crystal display device of this Example 2 is 4 micrometers, width L of a fine electrode part is 6 micrometers, and slit width S is 3 micrometers. The value of L + d-S is 7 µm, which satisfies the above expression (1). When halftones were displayed on the entire surface of the liquid crystal display of Example 2, no tile-like pattern was observed. Moreover, when the brightness | luminance at the time of the back display of this liquid crystal display device was measured, it turned out that it is about 7.1% improvement compared with the liquid crystal display device of the comparative example 3.

Example 3

The liquid crystal display device which has the pixel electrode as shown in FIG. 13 was manufactured. The thickness d of the liquid crystal layer of the liquid crystal display device of the third embodiment is 4 µm, the width L of the fine electrode portion is 6 µm, and the slit width S is 3 µm. The value of L + d-S is 7 µm, which satisfies the above expression (1). When halftones were displayed on the entire surface of the liquid crystal display of Example 3, no tile-like pattern was observed. Moreover, when the brightness | luminance at the time of the back display of this liquid crystal display device was measured, it turned out that it is about 7.1% improvement compared with the liquid crystal display device of the comparative example 3.

By comparing these Examples 1-3 with Comparative Examples 1-3, it is confirmed that the liquid crystal display device of this embodiment is effective for the improvement of display quality, and the transmittance | permeability at the time of white display is high, and it is effective for power saving. It became.

(Seventh embodiment)

The seventh embodiment of the present invention will be described below.

In the liquid crystal display device of the first embodiment, since there are no structures such as protrusions and wide slits, the aperture ratio can be increased. However, if the auxiliary capacitance is not made large enough with respect to the pixel capacitance, the voltage applied to the liquid crystal in one frame period (about 16.7 ms) greatly decreases, and the transmission intensity becomes saturated before the peak. This is a phenomenon called two-stage response. If the transmission intensity saturates to 90% or less by the two-stage response, the response speed of the liquid crystal panel cannot be shortened even if the liquid crystal rises rapidly. Therefore, in the present embodiment, the capacity value of the storage capacitance is increased while maintaining the aperture ratio, and the above-mentioned problem is solved. Hereinafter, with reference to FIG. 14, FIG. 15, it demonstrates concretely.

FIG. 14 is a plan view showing one pixel of the liquid crystal display device according to the seventh embodiment of the present invention, and FIG. 15 is a sectional view taken along the line I-I in FIG. In addition, illustration of the polarizing plate is abbreviate | omitted in FIG.

As illustrated in FIG. 14, the TFT substrate 310 includes a plurality of gate bus lines 312 extending in the horizontal direction (X-axis direction) and a plurality of data bus lines extending in the vertical direction (Y-axis direction). 317 is formed. In the center of the rectangular pixel region divided by these gate bus lines 312 and data bus lines 317, a storage capacitor bus line 313 is formed in parallel with the gate bus lines 312.

In each pixel area, the storage capacitor lower electrodes 313a and 313c, the TFT 318, the storage capacitor electrode 319b, the control electrodes 319a and 319c, and the first to third subpixel electrodes 321a to 321c. Is formed. The storage capacitor lower electrodes 313a and 313c are formed along the centerline of the pixel region parallel to the Y axis, and are electrically connected to the storage capacitor bus line 313.

The TFT 318 uses a portion of the gate bus line 312 as a gate electrode, and the drain electrode 318a and the source electrode 318b are disposed to face each other with the gate bus line 312 interposed therebetween.

The control electrodes 319a and 319c are formed at positions opposite to the storage capacitor lower electrodes 313a and 313c with the first insulating film 314 interposed therebetween, and are electrically connected to the drain electrode 318a. The storage capacitor electrode 319b is formed at a position facing the storage capacitor bus line 313 with the first insulating film 314 interposed therebetween, and is electrically connected to the control electrodes 319a and 319c. The storage capacitor is formed by the storage capacitor bus line 313 and the storage capacitor lower electrodes 313a and 313c, the storage capacitor electrode 319b and the control electrodes 319a and 319c, and the first insulating film 314 therebetween. Consists of.

The subpixel electrodes 321a to 321c are formed of a transparent conductor such as ITO, and are arranged along the data bus line 317 on the second insulating film 320. As shown in FIG. 14, the subpixel electrode 321a (capacitively coupled pixel electrode) is disposed in an upper region of the pixel region, and is divided into two regions (domain control region) on the center line parallel to the Y axis. It is divided into The slit 322 extending in the direction of 45 ° with respect to the X axis is formed in the region on the right side, and the slit 322 extending in the direction of 135 ° with respect to the Y axis is formed in the region on the left side. The subpixel electrode 321a is capacitively coupled to the control electrode 319a via the second insulating film 320.

The subpixel electrode 321b (directly connected pixel electrode) is disposed at the center of the pixel region, and is divided into four regions (domain control regions) on the center line parallel to the X axis and the center line parallel to the Y axis. have. A slit 322 extending in the direction of 45 ° with respect to the X axis is formed in the region of the upper right side, and a slit 322 extending in the direction of 135 ° with respect to the X axis is formed in the region of the upper left side. And a slit 322 extending in the direction of 225 ° with respect to the X axis in the lower left region, and a slit 322 extending in the direction of 315 ° with respect to the X axis in the lower right region. have. The subpixel electrode 321b is electrically connected to the storage capacitor electrode 319b through the contact hole 320a.

The subpixel electrode 321c (capacitively coupled pixel electrode) is disposed in a region below the pixel region, and is divided into two regions (domain control regions) on the center line parallel to the Y axis. A slit 322 extending in the direction of 315 ° with respect to the X axis is formed in the region on the right side, and a slit 322 extending in the direction of 225 ° with respect to the X axis in the left region. The subpixel electrode 319c is capacitively coupled to the control electrode 319c via the second insulating film 320.

Hereinafter, the structure of the TFT substrate 310 and the counter substrate 330 will be described in more detail with reference to the plan view of FIG. 14 and the cross-sectional view of FIG. 15.

On the glass substrate 311 serving as the base of the TFT substrate 310, a gate bus line 312, a storage capacitor bus line 313, and storage capacitor lower electrodes 313a and 313c are formed. These gate bus lines 312, storage capacitor bus lines 313, and storage capacitor lower electrodes 313a, 313c are simultaneously formed by, for example, patterning a metal film formed by stacking Al-Ti by photolithography. do.

On the gate bus line 312, the storage capacitor bus line 313, and the storage capacitor lower electrodes 313a and 313c, a first insulating film (gate insulating film) 314 made of SiO ₂ , SiN, or the like is formed. In a predetermined region of the first insulating film 314, a semiconductor film (amorphous silicon or polysilicon film) 315 serving as an active layer of the TFT 318 is formed. On this semiconductor film 315, a channel protective film 316 made of SiN or the like is formed, and on both sides of the channel protective film 316, drain electrodes 318a and source electrodes 318b of the TFT 318 are formed. have.

On the first insulating film 314, the data bus line 317 connected to the source electrode 318b of the TFT 318, the control electrodes 319a and 319c connected to the drain electrode 318a, and the storage capacitor An electrode 319b is formed. As shown in FIG. 15, the storage capacitor electrode 319b is formed at a position opposite to the storage capacitor bus line 313 with the first insulating film 314 interposed therebetween. The control electrode 319a is formed at a position opposite to the storage capacitor lower electrode 313a with the first insulating film 314 interposed therebetween, and the control electrode 319c is provided with the first insulating film 314 interposed therebetween. It is formed in the position facing the storage capacitor lower electrode 313c.

These data bus lines 317, the drain electrode 318a, the source electrode 318b, the control electrodes 319a and 319c, and the storage capacitor electrode 319b form a metal film formed by, for example, stacking Ti / Al / Ti. It is formed simultaneously by patterning by the photolithography method.

On the data bus line 317, the drain electrode 318a, the source electrode 318b, the control electrode 319a and the storage capacitor electrode 319b, a second insulating film 320 made of, for example, SiN is formed. Subpixel electrodes 321a to 321c are formed on the second insulating film 320. As described above, these subpixel electrodes 321a to 321c are provided with slits 322 extending in the oblique direction with respect to the X axis, respectively. In this embodiment, the width of each slit 322 provided in the subpixel electrodes 321a to 321c is 3.5 µm, and the width of the conductor portion (fine electrode portion) between the slits 322 is 6 µm.

The subpixel electrode 321a is capacitively coupled to the control electrode 319a through the second insulating film 320, and the subpixel electrode 321b is formed through the contact hole 320a formed in the second insulating film 320. It is electrically connected to the electrode 319b, and the subpixel electrode 321c is capacitively coupled to the control electrode 319c via the second insulating film 320.

On these control electrodes 319a to 319c, vertical alignment films (not shown) made of polyimide or the like are formed.

On the other hand, a black matrix 332, a color filter 333, and a common electrode 334 are formed on the glass substrate 331 (the lower side in FIG. 15) serving as the base of the counter substrate 330.

The black matrix 332 is made of metal such as Cr or a black resin, for example, and includes a gate bus line 312, a data bus line 317, a storage capacitor bus line 313, and a TFT on the TFT substrate 310 side. It is arrange | positioned in the position opposite to 318. There are three types of color filters 333, red, green, and blue, and color filters of any one color are arranged for each pixel region.

The common electrode 334 is made of a transparent conductor such as ITO, and is disposed on the color filter 333 (lower in FIG. 15). On this common electrode 334 (lower side in FIG. 15), a vertical alignment film (not shown) made of polyimide or the like is formed.

Between the TFT substrate 310 and the opposing substrate 330, a liquid crystal layer 340 made of a liquid crystal having negative dielectric anisotropy enclosed between these substrates 310 and 330 is disposed. In the liquid crystal layer 340, a polymer is formed which determines the alignment direction of the liquid crystal molecules at the time of voltage application. This polymer polymerizes the polymerization component (monomers, such as diacrylate) added in liquid crystal by irradiating an ultraviolet-ray in the state which applied the voltage between the subpixel electrodes 321a-321c and the common electrode 334. Formed.

In addition, in this embodiment, the liquid crystal of negative dielectric anisotropy is used. When liquid crystals having positive dielectric anisotropy are used, the liquid crystal molecules are oriented parallel to the substrate surface when no voltage is applied, so that the applied voltage cannot be increased when the polymerization component is polymerized. For this reason, it becomes difficult to make the orientation direction of a liquid crystal molecule into the direction which a slit extends.

In this embodiment, since the storage capacitor lower electrodes 313a and 313c and the control electrodes 319a and 319c are disposed at the boundary portion of the domain control region where the alignment directions of the liquid crystal molecules differ from each other, that is, the portion where the light does not transmit. The auxiliary capacitance can be increased without lowering the aperture ratio. On the contrary, the width of the storage capacitor bus line 313 and the storage capacitor electrode 319b may be made smaller by the amount of the capacitance constituted by the storage capacitor lower electrodes 313a and 313c and the control electrodes 319a and 319c. The aperture ratio can be increased while securing the capacitance value of the auxiliary capacitance.

Fig. 16 is a diagram showing the relationship between the pixel capacitance ratio (the ratio of the auxiliary capacitor and the pixel capacitor) on the horizontal axis and the voltage ratio on the vertical axis. In this case, the thickness (cell gap) of the liquid crystal layer is 4 µm, and the thickness of the first insulating film between the storage capacitor bus line and the storage capacitor lower electrode, the storage capacitor electrode and the control electrode is 0.33 µm, and the dielectric constant change amount Δε of the liquid crystal is The aperture ratio is -3.5 and 53%. The voltage ratio is a ratio of the write voltage in the white display and the voltage applied to the liquid crystal layer, and the write voltage in the white display is set to one.

In this case, the storage capacitor of the liquid crystal display device of the first embodiment shown in FIG. 3 is 1.5 in the pixel capacitance ratio. On the other hand, the storage capacitor of the liquid crystal display device of the present embodiment is 2.5 in the pixel capacity ratio. When the difference in the pixel capacity ratio is converted into the voltage ratio applied to the liquid crystal, it becomes 0.92 in the liquid crystal display device of the first embodiment and 0.94 in the liquid crystal display device of the present embodiment. If the voltage ratio is smaller than the voltage ratio at which the transmittance is 90%, it is found that the response speed of the liquid crystal panel does not increase even if the rise of the liquid crystal molecules is abrupt. The voltage at which the transmission intensity is 90% affects not only the optical properties of the liquid crystal but also the orientation uniformity of the liquid crystal molecules. In all of the liquid crystal display devices of the first embodiment and the present embodiment, the voltage ratio at which the transmittance was 90% was 0.93. From these things, it turns out that the liquid crystal display device of this embodiment has favorable response characteristics.

The liquid crystal display device of 1st Embodiment and the liquid crystal display device of this embodiment were actually manufactured, and the response speed was measured. That is, the response speed prescribed | regulated by the sum of the rise time (tau r) from 10% to 90% of penetration intensity | strengths, and the fall time (τf) from 90% to 10% was measured. As a result, the response speed was 20 ms in the liquid crystal display device of the first embodiment, whereas the response speed was short as 12 ms in the liquid crystal display device of the present embodiment.

(8th Embodiment)

EMBODIMENT OF THE INVENTION Hereinafter, 8th Embodiment of this invention is described.

In the liquid crystal display of the seventh embodiment described above, different voltages are applied to the subpixel electrodes 321a and 321c connected to the TFT 318 through capacitive coupling with the subpixel electrode 321b directly connected to the TFT 318. As a result, a potential difference occurs between the subpixel electrode 321b and the subpixel electrodes 321a and 321c. Because of this potential difference, the alignment direction of the liquid crystal molecules between the subpixel electrode 321b and the subpixel electrodes 321a and 321c is shifted from the direction in which the slit 322 extends. This phenomenon is called azimuth oscillation (or φ oscillation). When azimuth fluctuation occurs, the birefringence of the liquid crystal is locally lowered, dark lines are generated, which causes a decrease in the light transmittance.

It is a figure which shows the transmittance | permeability characteristic and orientation characteristic in the liquid crystal display device of 7th Embodiment. Reference numeral 2 in FIG. 17 denotes a storage capacitor lower electrode (corresponding to the storage capacitor lower electrodes 313a and 313c in FIG. 14), and reference numeral 4 denotes a control electrode (corresponding to control electrodes 319a and 319c in FIG. 14). Reference numeral 1 denotes a subpixel electrode (corresponding to the subpixel electrode 321b of FIG. 14) directly connected to the TFT, and reference numeral 3 denotes a subpixel electrode (capacitively coupled to the control electrode 4). Corresponding to the pixel electrodes 321a and 321c).

As shown in FIG. 17, since a potential difference occurs between the subpixel electrodes 1 and 3, a phenomenon in which the alignment direction of the liquid crystal molecules is shifted from the direction in which the slit extends (azimuth angle fluctuation) occurs. The portion where the azimuth fluctuation has occurred is reduced in the birefringence of the liquid crystal and becomes a dark line. In the liquid crystal display of the seventh embodiment, as shown by reference numeral 9 in FIG. 17, both sides of the fine electrode portion (the fine electrode portion closest to the subpixel electrode 1) of the edge portion of the subpixel electrode 3 ( A dark line occurs in each of the portions enclosed with broken lines in the right drawing of FIG. 17.

Therefore, in this embodiment, generation | occurrence | production of the dark line between the subpixel electrode directly connected to TFT, and the subpixel electrode connected to TFT through capacitive coupling is suppressed, and substantial improvement of an aperture ratio is implement | achieved. Hereinafter, with reference to FIG. 18, it demonstrates concretely.

18 is a plan view illustrating one pixel of the liquid crystal display device of the eighth embodiment of the present invention. 18, the same code | symbol is attached | subjected to the same thing as FIG. 14, and description of the overlapping part is abbreviate | omitted.

In this embodiment, the storage capacitor lower electrode is located below the region between the subpixel electrode 321b directly connected to the TFT 318 and the subpixel electrodes 321a and 321c capacitively coupled to the control electrodes 319a and 319c. 341 and the control electrode 345 are arrange | positioned. The storage capacitor lower electrode 341 is formed in parallel with the slit 322 in the vicinity thereof and is connected to the storage capacitor lower electrodes 313a and 313c. The control electrode 345 is formed at a position opposite to the storage capacitor lower electrode 341 via the first insulating film, and is connected to the control electrodes 319a and 319c.

As described above, in the liquid crystal display device of the present embodiment, under the region between the subpixel electrode 321b and the subpixel electrodes 321a and 321c, at the same potential as the drain electrode 318a of the TFT 318. The control electrode 345 is formed. Therefore, a horizontal electric field is generated between the subpixel electrode 321b and the subpixel electrodes 321a and 321c, and an inclined electric field is generated between the subpixel electrodes 321a and 321c and the control electrode 345. .

Since the intensity (field density) of the electric field is proportional to the distance between the potential difference and the electrode, the distance between the subpixel electrode 321b and the subpixel electrodes 321a and 321c is 3.5 占 퐉 (same as the width of the slit 322). When the thickness of the insulating film between the control electrode 345 and the subpixel electrodes 321a and 321c is set to 0.33 µm, the inclined electric field affects the liquid crystal molecules rather than the horizontal electric field affecting the liquid crystal molecules. This becomes large. For this reason, a dark line does not generate | occur | produce only a part of the subpixel electrode 321b of the fine electrode part of the edge part of subpixel electrode 321a, 321c, and a substantial aperture ratio improves.

19 is a diagram illustrating the transmittance characteristics and the orientation characteristics in the liquid crystal display device of the present embodiment. In FIG. 19, the same code | symbol is attached | subjected to the same thing as FIG. As shown in this FIG. 19, in the liquid crystal display device of this embodiment, dark lines generate | occur | produce only a part of the side (part enclosed with a broken line in FIG. 19) of the fine electrode part of the edge part of the subpixel electrode 3 . From this comparison of FIG. 19 and FIG. 17, it can be seen that the actual aperture ratio of the liquid crystal display device of the present embodiment is improved as compared with the liquid crystal display device shown in FIG. 17.

In the present embodiment, since the storage capacitor lower electrode 341 is formed below the control electrode 345, the storage capacitor becomes larger than the liquid crystal display device of the seventh embodiment. This has the advantage that the response time of the liquid crystal panel is further shortened.

As shown in FIG. 20, the width of the storage capacitor bus line 313 and the storage capacitor electrode 319b may be made smaller by the amount of the capacitance formed by the control electrode 345 and the storage capacitor lower electrode 341. Thereby, there exists an advantage that a substantial opening ratio further improves.

When the difference in pixel capacity ratio is converted into a voltage ratio applied to the liquid crystal, the voltage ratio becomes 0.96 in the liquid crystal display device shown in FIG. 18, and the voltage ratio becomes 0.94 in the liquid crystal display device shown in FIG. Moreover, the liquid crystal display device shown in FIG. 18, FIG. 20 was actually manufactured, and these response speeds were measured. As a result, the response speed of the liquid crystal display device shown in FIG. 18 was 10 ms, and the response speed of the liquid crystal display device shown in FIG. 20 was 12 ms.

(Ninth embodiment)

21 is a plan view illustrating one pixel of the liquid crystal display device of the ninth embodiment of the present invention. In FIG. 21, the same code | symbol is attached | subjected to the same thing as FIG. 18, and the detailed description is abbreviate | omitted.

In the present embodiment, the subpixel electrodes 351a and 351b are formed between the subpixel electrode 321b (directly connected pixel electrode) and the subpixel electrodes 321a and 321c (capacitively coupled pixel electrode). These subpixel electrodes 351a and 351b are also formed of ITO similarly to the subpixel electrodes 321a to 321c. The subpixel electrodes 351a and 351b extend in the same direction as the fine electrode portions of the subpixel electrodes 321a to 321c in the vicinity thereof.

The storage capacitor lower electrode 341 and the control electrode 345 are formed in a region between the subpixel electrodes 351a and 351b and the subpixel electrodes 321a and 321c. The subpixel electrodes 351a and 351b are capacitively coupled to the control electrodes (control electrodes 319a and 345 or control electrodes 319c and 345) through the second insulating film. In this embodiment, since the capacitance between the subpixel electrode 351 and the control electrode is large, a voltage larger than the control electrodes 321a and 321c is applied to the subpixel electrodes 351a and 351b. That is, in this embodiment, the applied voltage becomes smaller in order of the control electrode 321b, the control electrodes 351a and 351b, and the control electrodes 321a and 321c.

As described above, in the present embodiment, the potential difference between adjacent subpixels is smaller than in the case where there is no subpixel electrode 351. Thereby, generation | occurrence | production of the dark ship by azimuth angle fluctuation can be further reduced.

22 is a diagram illustrating transmittance characteristics in the liquid crystal display device of the present embodiment. In FIG. 22, the same code | symbol is attached | subjected to the same thing as FIG. It is understood from the comparison between FIG. 22 and FIG. 19 that the actual aperture ratio is further improved in the liquid crystal display device of the present embodiment as compared with the liquid crystal display device shown in FIG. 19.

When the difference in pixel capacity ratio is converted into a voltage ratio applied to the liquid crystal, the voltage ratio is 0.94 in the liquid crystal display device of the present embodiment. Moreover, as a result of actually manufacturing the liquid crystal display of this embodiment and measuring the response speed, the response speed was 12 ms.

(10th embodiment)

The tenth embodiment of the present invention will be described below.

As described above, in the liquid crystal display device shown in FIG. 1, when the voltage is applied, the alignment of the liquid crystal molecules is disturbed at the proximal end or the distal end of the slit, which causes a substantial decrease in the aperture ratio. Subsequently, by extending the fine electrode portion closer to the data bus line, the substantial aperture ratio can be improved.

23 (a), 23 (b) and 24 (a), (b) show light at the time of voltage application in a liquid crystal display device in which the distance between the fine electrode portion and the data bus line is 7 μm or 5 μm. It is a figure which shows the transmission state. 23 (a) and 23 (b) all show the light transmission state when there is no black matrix BM, and FIGS. 24A and 24B all show the black matrix BM when present. The transmission state of the light is shown. Moreover, the width | varieties of a microelectrode part are all 6 micrometers, and all the slit widths are 3.5 micrometers.

It is understood from Figs. 23A and 23B that a dark portion resulting from the disturbance of the liquid crystal molecules is generated at the tip portion of the fine electrode portion. And from the comparison of FIG. 23 (a) and FIG. 23 (b), when the space | interval of a fine electrode part and a data bus line is made small, it turns out that the area | region of a dark part becomes small. In an actual liquid crystal display device, as shown in FIGS. 24A and 24B, the black electrode is covered between the fine electrode portion and the data bus line. When the luminance of the liquid crystal display of FIGS. 24A and 24B was measured, the luminance of the liquid crystal display of FIG. 24A was 170 cd / m ² , and the liquid crystal display of FIG. 24B was measured. The luminance of was 181 cd / m ² .

As described above, by extending the fine electrode portion to the vicinity of the data bus line and covering the fine electrode portion and the data bus line with a black matrix, the actual aperture ratio of the liquid crystal display device can be increased to improve luminance. . However, if the distance between the fine electrode portion and the data bus line is further reduced, the display quality is lowered due to cross talk.

25 (a) and 25 (b) are diagrams showing the results of investigating the transient characteristics of the liquid crystal display device after applying a voltage to the liquid crystal and stabilizing the alignment using a high speed camera. 25 (a) shows the transient characteristics of the liquid crystal display device in which linear polarizers are arranged on both sides of the liquid crystal panel, and FIG. 25 (b) shows circular polarizers (linear polarizer +1/4) on both sides of the liquid crystal panel. The transient characteristic of the liquid crystal display device which has arrange | positioned the wave plate) is shown. Moreover, the space | interval of a fine electrode part and a data bus line is 7 micrometers, the width | variety of a fine electrode part is 6 micrometers, and the slit width is 3.5 micrometers. In a normal liquid crystal display device, 16.7 ms is set to one frame.

25 (a) and (b) show that luminance and response speed can be improved by using a circular polarizing plate. However, since a circular polarizing plate is expensive compared with a linear polarizing plate, a circular polarizing plate may not be available depending on the use of a liquid crystal display device. It can be seen from FIG. 25A that the liquid crystal molecules at the proximal end and the distal end of the slit take time until the alignment is stabilized.

Therefore, in this embodiment, the brightness and the response characteristic of a liquid crystal display device are improved by improving the orientation of the liquid crystal molecule in the base end side and the front end side of the slit of a pixel electrode. The liquid crystal display device of this embodiment is demonstrated more concretely by Examples 1-4 described below.

In the following embodiments, a film made of a dielectric may be formed in the same shape as the slit instead of the slit. Similarly to the slit, the alignment direction of the liquid crystal molecules can be controlled by the dielectric film, so that similar effects can be obtained.

Example 1

FIG. 26 is a plan view illustrating one pixel of the liquid crystal display according to Example 1 of the tenth embodiment. FIG.

On the TFT substrate, a gate bus line 412 extending in the horizontal direction (X axis direction) and a data bus line 417 extending in the vertical direction (Y axis direction) are formed. A storage capacitor bus line 413 is formed parallel to the gate bus line 412 at the center of the rectangular pixel area divided by the gate bus line 412 and the data bus line 417.

In each pixel region, the TFT 418, the control electrode 419a, the storage capacitor electrode 419c, and the pixel electrode 421 are formed.

The TFT 418 uses a portion of the gate bus line 412 as a gate electrode, and the drain electrode 418a and the source electrode 418b are disposed to face each other with the gate bus line 412 interposed therebetween. The control electrode 419a is electrically connected to the drain electrode 418a of the TFT 418. The storage capacitor electrode 419c is formed at a position opposite the storage capacitor bus line 413 with the first insulating film interposed therebetween, and the drain electrode 418a of the TFT 418 via the control electrode 419a. Is electrically connected to.

The pixel electrode 421 is formed of a transparent conductor such as ITO, and has four regions in which the alignment directions of the liquid crystal molecules are different from each other on the center line parallel to the X axis and the center line parallel to the Y axis (domain control region). It is divided into In the first area of the upper right side, the slit 422a extending in the 45 ° direction with respect to the X axis, the slit 422b extending in the 65 ° direction, and the slit extending in the 45 ° direction and the slit extending in the 65 ° direction. The slits 422c formed by combining these are formed. Moreover, in the 2nd area | region of an upper left side, the slit 422d extended in a 135 degree direction with respect to an X axis, the slit 422e extending in a 115 degree direction, and the slit extended in a 135 degree direction, and an elongation in a 115 degree direction The slit 422f which combines the said slit is formed. In addition, in the lower left third region, the slit 422g extending in the 225 ° direction with respect to the X axis, the slit 422h extending in the 245 ° direction, and the slit extending in the 225 ° direction and the slit extending in the 245 ° direction. The slits 422i formed by combining the slits to be formed are formed. Further, in the fourth region at the lower right, the slit 422j extending in the 315 ° direction with respect to the X axis, the slit 422k extending in the 295 ° direction, and the slit extending in the 315 ° direction and the extension in the 295 ° direction. The slits 422m formed by combining the slits to be formed are formed.

The pixel electrode 421 is electrically connected to the storage capacitor electrode 419c through the contact hole 420a formed in the second insulating film. The surface of the pixel electrode 421 is covered with a vertical alignment film made of polyimide or the like.

In addition, the dashed-dotted line of FIG. 26 has shown the position of the edge of the black matrix formed in the opposing board | substrate. In addition, also in the liquid crystal display of Example 1, since the structure of a counter substrate is basically the same as that of 1st Embodiment, the description is abbreviate | omitted here. Also in the liquid crystal display device of the first embodiment, a liquid crystal layer made of a liquid crystal having negative dielectric anisotropy is disposed between the TFT substrate and the counter substrate, and a polymerization component (monomer or oligomer) added to the liquid crystal in the liquid crystal layer. It contains a polymer formed by polymerization by ultraviolet irradiation in the state where a voltage is applied to the liquid crystal. The orientation direction of the liquid crystal molecules at the time of voltage application is determined by this polymer.

In the liquid crystal display device shown in FIG. 1, for example, in the liquid crystal molecules in the vicinity of the connection electrode portion arranged along the center line of the pixel electrode parallel to the Y axis in the first region, an electric force line generated from the connection electrode portion is used. As a result, a force that is inclined in the direction perpendicular to the connection electrode portion (the direction of 0 °) is generated. Moreover, the force which tries to incline to 45 degree direction with respect to an X axis is added to the liquid crystal molecule near a connection electrode part by a slit. As a result, the liquid crystal molecules in the vicinity of the connecting electrode portion are inclined in the direction where these two forces are balanced. That is, the direction in which the liquid crystal molecules in the vicinity of the connection electrode part are inclined becomes a direction smaller than 45 ° with respect to the X axis.

On the other hand, in the liquid crystal display device of the first embodiment shown in FIG. 26, for example, the direction of the slit near the connection electrode portion is larger than 45 ° in the first region, so that the liquid crystal molecules near the connection electrode portion are changed. Can be tilted in approximately 45 ° direction. Thereby, generation | occurrence | production of the dark part in the vicinity of a connection electrode part is suppressed, and the transmittance | permeability improves. Moreover, since the orientation stability of the liquid crystal molecule near a connection electrode part improves, a response characteristic improves.

Example 2

27 is a plan view illustrating one pixel of the liquid crystal display according to Example 2 of the tenth embodiment. The liquid crystal display device of Example 2 differs from the liquid crystal display device of Embodiment 1 shown in FIG. 26 in that the shapes of the slits provided in the pixel electrodes are different from each other. Since it is the same as that of a liquid crystal display device, the same code | symbol is attached | subjected to the same thing as FIG. 26 in FIG. 27, and the detailed description is abbreviate | omitted.

In the liquid crystal display of Example 2, as shown in FIG. 27, the pixel electrode 441 is divided into four areas (domain control area) with the center line parallel to the X axis and the center line parallel to the Y axis. In each of the regions, slits 442 extending in a direction parallel to the X axis are provided. Upon application of voltage, all liquid crystal molecules in each region are oriented along the slit 442 in the direction toward the center. That is, upon application of voltage, the liquid crystal molecules in the regions of the upper right and lower right incline in the 180 ° direction with respect to the X axis, and the liquid crystal molecules of the regions of the upper left and lower left incline in the 0 ° direction with respect to the X axis. .

In the liquid crystal display device of the present Example 2, since the orientation division number becomes 2, the viewing angle characteristic is worse than that of the liquid crystal display device of Example 1 in which the orientation division number becomes 4. However, since the direction in which the liquid crystal molecules on the front end side of the slit 442 (the data bus line side) are inclined coincides with the direction of the slit, there is an advantage that an orientation defect on the front end side of the slit 442 is avoided. Moreover, the orientation stability of the liquid crystal molecule in the front end side of the slit 442 improves.

Example 3

FIG. 28 is a plan view illustrating one pixel of a liquid crystal display according to Example 3 of the tenth embodiment. FIG. The liquid crystal display device of Example 3 differs from the liquid crystal display device of Embodiment 1 shown in FIG. 26 in that the slits provided in the pixel electrodes are different from each other. Since it is the same as that of a liquid crystal display device, the same code | symbol is attached | subjected to the same thing as FIG. 26 in FIG. 28, and the detailed description is abbreviate | omitted.

Also in the liquid crystal display of Example 3, as shown in FIG. 28, the pixel electrode 451 is divided into four areas (domain control area) on the basis of the center line parallel to the X axis and the center line parallel to the Y axis. It is. The slit 452a extending in the 45 degree direction with respect to the X-axis, and the slit 452b extending in the 25 degree direction are provided in the 1st area | region of an upper right side. Moreover, the slit 452c extended in the 135 degree direction with respect to the X-axis, and the slit 452d extended in the 155 degree direction are provided in the 2nd area | region of an upper left side. Moreover, the slit 452e extended in the 225 degree direction with respect to the X axis | shaft, and the slit 452f extended in the 205 degree direction are provided in the 3rd area | region of the lower left side. Moreover, the slit 452g extended in the 315 degree direction with respect to the X axis | shaft, and the slit 452h extending in the 335 degree direction are provided in the 4th area | region of the lower right side.

Also in the third embodiment, one pixel region is divided into four regions (domain control regions) in which the alignment directions of liquid crystal molecules differ from each other by slits provided in the pixel electrode 451. Each region is provided with slits extending in the 45 °, 135 °, 225 ° or 315 ° directions with respect to the X axis, and slits extending in the 25 °, 155 °, 205 ° or 335 ° directions, respectively. Thereby, generation | occurrence | production of the dark part in the front end side (data bus line side) of a slit can be suppressed compared with the liquid crystal display device shown in FIG.

Example 4

29 is a plan view illustrating one pixel of the liquid crystal display according to Example 4 of the tenth embodiment. The liquid crystal display device of Example 4 differs from the liquid crystal display device of Embodiment 1 shown in FIG. 26 in that the slits provided in the pixel electrodes are different from each other. Since it is the same as that of a liquid crystal display, in FIG. 29, the same code | symbol is attached | subjected to the same thing as FIG. 26, and the detailed description is abbreviate | omitted.

Also in the liquid crystal display of the fourth embodiment, as shown in FIG. 29, the pixel electrode 461 is divided into four regions (domain control regions) on the center line parallel to the X axis and the center line parallel to the Y axis. It is divided. In the first area of the upper right side, a slit in which the proximal side (the connecting electrode portion side) extends in the direction of 45 ° with respect to the X axis, and the distal end side (the data bus line side) extends in the direction of 25 ° with respect to the X axis ( 462a) is provided. Moreover, the slit 462b which protrudes in the direction of 135 degrees with respect to an X axis, and the front end side extends in the direction of 155 degrees with respect to an X axis is provided in the 2nd area | region of an upper left side. Moreover, the slit 462c in which the base end extends in the direction of 225 degree with respect to an X axis, and the front end side extends in the direction of 205 degree with respect to an X axis is provided in the 3rd area of lower left. Moreover, the slit 462d in which the base end extends in the direction of 315 degree with respect to an X axis, and the front end side extends in the direction of 335 degree with respect to an X axis is provided in the 4th area | region of the lower right side.

Also in the fourth embodiment, one pixel region is divided into four regions having different alignment directions of liquid crystal molecules by slits provided in the pixel electrode 461. And since the front end side of each slit is provided at the angle close to a right angle with respect to the data bus line 417, generation | occurrence | production of the dark part in the front end part of a slit can be suppressed. Moreover, the orientation stability of the liquid crystal molecule in a slit tip part improves. In addition, as in Example 4, the width of the fine electrode portion on the side of the data bus line is made thick to confirm that generation of display unevenness due to stepper exposure when patterning the ITO film is suppressed.

(Eleventh embodiment)

As described above, by forming a subpixel electrode (capacitively coupled pixel electrode) connected to the TFT via capacitive coupling with a subpixel electrode (directly connected pixel electrode) directly connected to the TFT in one pixel, when viewed in the oblique direction Deterioration of display quality can be suppressed.

Fig. 30 shows the relationship between the back display voltage, the direct pixel electrode ratio and the gamma deviation amount by taking the white display voltage on the horizontal axis and the area ratio (direct pixel electrode ratio) of the direct pixel electrode to the total area of the pixel electrode on the vertical axis. It is a figure which shows. In FIG. 30, the direct connection pixel electrode ratio 0% indicates only the capacitively coupled pixel electrode, and the direct connection pixel electrode ratio 100% indicates only the direct connection pixel electrode. The gamma deviation amount is an average value of the difference between the gamma value when the liquid crystal panel is viewed from the front and the gamma value when viewed from a polar angle of 60 ° (60 ° to the normal of the panel). It shows that the display quality as seen from the oblique direction is good.

In the liquid crystal display device (conventional example) shown in FIG. 1, since the ratio of the direct pixel electrode is 100%, the gamma deviation amount is 2 when the back display voltage is 6V from FIG. 30. 30 shows that when the direct pixel electrode ratio is 10 to 40% and the back display voltage is 4V, the gamma deviation amount is 1 or less, and the display quality when viewed in the inclined direction becomes good. . In this case, however, the screen is dark because the white display voltage is low. When the back display voltage is 6 V, when the area ratio of the direct-connected pixel electrode is 10 to 70%, bright display is possible, and the gamma deviation amount is 1.4 or less, so that the display quality can be kept relatively good even when viewed in the inclined direction. Can be. Therefore, the area ratio of the direct connection pixel electrode is preferably 10 to 70%.

31 is a plan view illustrating a liquid crystal display device 1 of the eleventh embodiment of the present invention. In this liquid crystal display device, the width L1 of the microelectrode portion of the direct-connected pixel electrode 511b is 5 μm, the slit width S1 is 3.5 μm, and the width L2 of the fine electrode portion of the capacitively coupled pixel electrodes 511a, 511c is 4 μm, The slit width S2 is set to 3.5 µm, and the ratio of the area M of the direct connection pixel electrode 511b and the area S of the capacitively coupled pixel electrodes 511a and 511c is set to M: S = 5: 5.

32 is a plan view illustrating a liquid crystal display device 2 according to an eleventh embodiment of the present invention. In this liquid crystal display device, the width L1 of the fine electrode portion of the direct-connected pixel electrode 511b is 6 μm, the slit width S1 is 3.5 μm, and the width L2 of the fine electrode portion of the capacitively coupled pixel electrodes 511a, 511c is 4 μm, The slit width S2 is set to 3.5 µm, and the ratio of the area M of the direct connection pixel electrode 511b and the area S of the capacitively coupled pixel electrodes 511a and 511c is set to M: S = 5: 5.

33 is a plan view illustrating a liquid crystal display device 3 of the eleventh embodiment of the present invention. In this liquid crystal display device, the width L1 of the fine electrode portion of the direct-connected pixel electrode 511b is 6 μm, the slit width S1 is 3.5 μm, and the width L2 of the fine electrode portion of the capacitively coupled pixel electrodes 511a, 511c is 4 μm, The slit width S2 is set to 3.5 µm, and the ratio of the area M of the direct connection pixel electrode 511b to the area S of the capacitively coupled pixel electrodes 511a and 511c is set to M: S = 4: 6.

34 is a plan view showing a liquid crystal display device 4 of the eleventh embodiment of the present invention. In this liquid crystal display device, the width L1 of the fine electrode portion of the direct-connected pixel electrode 511b is 6 μm, the slit width S1 is 3.5 μm, and the width L2 of the fine electrode portion of the capacitively coupled pixel electrodes 511a, 511c is 4 μm, The slit width S2 is set to 3.5 µm, and the ratio of the area M of the direct connection pixel electrode 511b and the area S of the capacitively coupled pixel electrodes 511a and 511c is set to M: S = 3: 7.

When the width of the fine electrode portion is made thick, generation of display unevenness due to stepper exposure when patterning the ITO film can be suppressed, but the orientation regulating force on the liquid crystal molecules is weakened. 31-34, the width | variety of the microelectrode part of direct connection pixel electrode 511b is made thick, and the width | variety of the microelectrode part of capacitively coupled pixel electrode 511a, 511c is narrowed, and it is made to a liquid crystal molecule. It is possible to prevent the occurrence of display unevenness due to stepper exposure while maintaining the orientation control force with respect to. In addition, by setting the ratio of the directly connected pixel electrodes within the range of 10 to 70%, the gamma deviation amount is reduced, and the display quality when viewed in the inclined direction is improved.

In the above-described first embodiment (see FIG. 3), a case where a plurality of regions having different transmittance-applied voltages (TV characteristics) are formed by providing a direct connection pixel electrode and a capacitively coupled pixel electrode in one pixel. Although it demonstrated, by changing the conditions (ultraviolet intensity, the wavelength of an ultraviolet-ray, etc.) at the time of superposing | polymerizing the superposition | polymerization component added in the liquid crystal, several area | regions from which a transmittance | permeability-applied voltage characteristic differ from each other can be formed in one pixel.

Moreover, when superposing | polymerizing the polymerization component added to the liquid crystal, you may irradiate an ultraviolet-ray by changing voltage application conditions to a red (R) pixel, a green (G) pixel, and a blue (B) pixel. As a result, the gamma characteristics of the red (R) pixel, the green (G) pixel, and the blue (B) pixel can be made uniform, and a liquid crystal display device having a very small color difference can be realized.

In addition, by providing a region having different polymerization conditions of monomers in one pixel, or by providing a plurality of regions having different surface energies on the substrate surface, and then polymerizing a polymerization component added to the liquid crystal in one pixel, A plurality of regions having different transmittance-applied voltage characteristics can be formed. For example, by partially forming a resin film on a substrate, the conditions when the monomer added in the liquid crystal polymerizes and the surface energy of the substrate surface can be changed.

Further, by providing a plurality of regions having different widths and slit widths (line and space) of the fine electrode portion in one pixel, a plurality of regions having different transmittance-applied voltage characteristics can be formed in one pixel.

In addition, in the above-mentioned embodiment, although all the polymerization components added in the liquid crystal were made to superpose | polymerize by ultraviolet irradiation, you may superpose | polymerize a polymerization component by heat processing, or even if it superposes | polymerizes a polymerization component using a combination of an ultraviolet irradiation process and a heat treatment. do.

Moreover, in each embodiment mentioned above, in order to compensate the optical anisotropy which a liquid crystal layer has, you may arrange | position the optical retardation film which has a slow axis in the direction parallel to a board | substrate surface (liquid crystal panel surface).

Hereinafter, various aspects of this invention are collectively described as supplementary notes.

(Supplementary Note 1) The first and second substrates disposed to face each other,

A liquid crystal having a negative dielectric anisotropy encapsulated between the first and second substrates;

It has a polymer which superposes | polymerizes and forms the superposition | polymerization component added in the said liquid crystal, and determines the direction in which a liquid crystal molecule inclines at the time of voltage application,

Each of the first substrates includes a switching element, a plurality of strip-shaped fine electrode portions, a first subpixel electrode formed of a connection electrode portion electrically connecting them to each other, a plurality of strip-shaped fine electrode portions, and the like. A second subpixel electrode constituted by a connection electrode portion electrically connecting them to each other,

A common electrode is formed on the second substrate to face the first and second subpixel electrodes;

A first voltage is applied to the first subpixel electrode through the switching element, and a second voltage lower than the first voltage is applied to the second subpixel electrode.

(Supplementary Note 2) The liquid crystal display device according to Supplementary Note 1, wherein the first subpixel electrode is directly connected to the switching element.

(Supplementary Note 3) The liquid crystal display device according to Supplementary Note 1, wherein the second subpixel electrode is connected to the switching element via a capacitive coupling.

(Supplementary Note 4) The liquid crystal display device according to Supplementary note 3, wherein the first and second subpixel electrodes are all divided into a plurality of regions having different directions in which the fine electrode portion extends.

(Supplementary Note 5) The liquid crystal display device according to Supplementary note 4, wherein the electrodes constituting the capacitive coupling are disposed below the first and second subpixel electrodes and are arranged along the boundaries of the plurality of regions.

(Supplementary note 6) A supplementary note, which has a storage capacitor electrode electrically connected to the first subpixel electrode and constitutes a storage capacitor, wherein the storage capacitor electrode is arranged along a boundary of the plurality of regions. The liquid crystal display device described in 4.

(Supplementary Note 7) Further, a gate bus line to which a signal for turning on / off the switching element is supplied, a data bus line connected to the switching element to supply a display signal, and first and second substrates encapsulating the liquid crystal. It has a 1st and 2nd polarizing plate arrange | positioned through the gap, The liquid crystal display device of the appendix 1 characterized by the above-mentioned.

(Supplementary Note 8) The direction in which the fine electrode portions of the first and second subpixel electrodes extend is a direction crossing with both the gate bus line and the data bus line, and absorption of one of the polarizing plates of the first and second polarizing plates is performed. The axis | shaft is parallel to the said gate bus line, and the absorption axis of the other polarizing plate is a direction orthogonal to the said gate bus line, The liquid crystal display device of the note 7 characterized by the above-mentioned.

(Supplementary note 9) The liquid crystal display device according to supplementary note 7, wherein the data bus line has a curved shape.

(Supplementary note 10) The liquid crystal display device according to supplementary note 9, wherein at least part of the data bus line extends in a direction orthogonal to a direction in which the fine electrode portion extends.

(Supplementary Note 11) The liquid crystal display device according to Supplementary note 10, wherein slits are provided only at ends and bent portions of the first and second subpixel electrodes.

(Supplementary note 12) The first and second substrates disposed to face each other,

A liquid crystal having a negative dielectric anisotropy encapsulated between the first and second substrates;

It has a polymer which superposes | polymerizes and forms the superposition | polymerization component added in the said liquid crystal, and determines the direction in which a liquid crystal molecule inclines at the time of voltage application,

In the first substrate, a pixel electrode composed of a switching element, a plurality of strip-shaped fine electrode portions, and a connection electrode portion electrically connecting them to each other are formed in each pixel,

And a notch at a portion of the tip portion of the fine electrode portion that does not face the adjacent fine electrode portion.

(Supplementary note 13) The liquid crystal display device according to Supplementary note 12, wherein L + d-S ≧ 4 μm is satisfied when the width of the fine electrode portion is L, the interval between the fine electrodes is S, and the thickness of the liquid crystal layer is d.

(Appendix 14) Further, a gate bus line to which a signal for turning on / off the switching element is supplied, a data bus line connected to the switching element to supply a display signal, and first and second substrates encapsulating the liquid crystal. It has a 1st and 2nd polarizing plate arrange | positioned across the gap, The liquid crystal display device of the appendix 12 characterized by the above-mentioned.

(Supplementary Note 15) The first and second substrates disposed to face each other,

A liquid crystal having a negative dielectric anisotropy encapsulated between the first and second substrates;

It has a polymer which superposes | polymerizes and forms the superposition | polymerization component added in the said liquid crystal, and determines the direction in which a liquid crystal molecule inclines at the time of voltage application,

In the first substrate, a pixel electrode composed of a switching element, a plurality of strip-shaped fine electrode portions, and a connection electrode portion electrically connecting them to each other are formed in each of the pixels,

The shape of the area | region between the fine electrode parts of the base end side of the said fine electrode part is a shape which becomes line symmetry with respect to the centerline of the area | region between the said fine electrode parts.

(Supplementary note 16) The liquid crystal display device according to supplementary note 15, wherein the shape of the region between the fine electrode portions on the proximal end of the fine electrode portion is rectangular.

(Supplementary Note 17) The liquid crystal display device according to Supplementary note 15, wherein the shape of the region between the fine electrode portions on the proximal side of the fine electrode portion is an isosceles triangle.

(Supplementary Note 18) Further, a gate bus line to which a signal for turning on / off the switching element is supplied, a data bus line connected to the switching element to supply a display signal, and first and second substrates encapsulating the liquid crystal. It has a 1st and 2nd polarizing plate arrange | positioned through it, The liquid crystal display device of the note 15 characterized by the above-mentioned.

(Supplementary Note 19) The first and second substrates disposed to face each other,

A liquid crystal having a negative dielectric anisotropy encapsulated between the first and second substrates;

It has a polymer which superposes | polymerizes and forms the superposition | polymerization component added in the said liquid crystal, and determines the direction in which a liquid crystal molecule inclines at the time of voltage application,

In the first substrate, a pixel electrode composed of a switching element, a plurality of strip-shaped fine electrode portions, and a connection electrode portion electrically connecting them to each other are formed in each pixel,

The shape of the region between the microelectrode portions on the proximal side of the microelectrode portion has a cutout at a portion not facing the adjacent microelectrode portion among the tip portions of the microelectrode portion, with respect to the centerline of the region between the microelectrode portions. The liquid crystal display device characterized by the shape which becomes linear symmetry.

(Supplementary Note 20) The first and second substrates disposed to face each other,

A liquid crystal encapsulated between the first and second substrates,

It has a polymer which superposes | polymerizes and forms the superposition | polymerization component added in the said liquid crystal, and determines the direction in which a liquid crystal molecule inclines at the time of voltage application,

On the first substrate,

A gate bus line extending in one direction,

A data bus line extending in a direction crossing the gate bus line;

A storage capacitor bus line in parallel with the gate bus line;

A switching element formed for each pixel region partitioned by the gate bus line and the data bus line;

A first portion constituted by a plurality of band-shaped fine electrode portions and a connecting electrode portion electrically connecting them to each other, having a plurality of domain control regions having different alignment directions of liquid crystal molecules, and directly connected to the first switching element. A pixel electrode,

A plurality of domain control regions disposed in the same pixel region as the first subpixel electrode and constituted by a plurality of band-shaped fine electrode portions and a connection electrode portion electrically connecting them to each other, and having different alignment directions of liquid crystal molecules; A second subpixel electrode having:

A storage capacitor electrode disposed at a position opposite to the storage capacitor bus line with a first insulating film interposed therebetween;

A control electrode connected to the switching element, disposed at a position opposite to a boundary of the domain control region of the first and second subpixel electrodes, and capacitively coupled to the second subpixel electrode through a second insulating film;

A storage capacitor lower electrode connected to the storage capacitor bus line and disposed at a position opposite to the control electrode with the first insulating film interposed therebetween,

And a common electrode facing the first and second subpixel electrodes on the second substrate.

(Supplementary Note 21) The liquid crystal display device according to Supplementary Note 20, wherein the first subpixel electrode is electrically connected to the storage capacitor electrode through a contact hole formed in the second insulating film.

(Supplementary note 22) The liquid crystal display device according to supplementary note 20, wherein the storage capacitor electrode is disposed at a position facing the boundary of the domain control region of the first subpixel electrode.

(Supplementary Note 23) The second storage capacitor lower electrode connected to the storage capacitor lower electrode and the first insulating film connected to the control electrode are interposed between the first and second subpixel electrodes. 2 A liquid crystal display device according to Appendix 20, having a second control electrode opposite the storage capacitor lower electrode.

(Supplementary note 24) A third subpixel electrode capacitively coupled to the control electrode is formed between the first and second subpixel electrodes, and the second storage capacitor lower electrode and the second control electrode are connected to the third subpixel. The liquid crystal display device according to Appendix 23, which is disposed between an electrode and the first subpixel electrode.

(Supplementary note 25) The liquid crystal according to Supplementary note 24, wherein a voltage lower than a voltage applied to the first subpixel electrode and higher than a voltage applied to the second subpixel electrode is applied to the third subpixel electrode. Display device.

(Supplementary note 26) The liquid crystal display device according to supplementary note 20, wherein the storage capacitor bus line and the control electrode are perpendicular to the center of the pixel region.

(Supplementary note 27) The liquid crystal display device according to supplementary note 20, wherein the liquid crystal is oriented perpendicular to the substrate surface when no voltage is applied.

(Supplementary note 28) The first and second substrates disposed to face each other,

A liquid crystal having a negative dielectric anisotropy encapsulated between the first and second substrates;

It has a polymer which superposes | polymerizes and forms the superposition | polymerization component added in the said liquid crystal, and determines the direction in which a liquid crystal molecule inclines at the time of voltage application,

In the first substrate, a pixel electrode divided into switching regions and a plurality of regions having different alignment directions of liquid crystal molecules are formed for each pixel,

The pixel electrode is constituted by a plurality of strip-shaped fine electrode portions formed in each region and a connection electrode portion electrically connecting them, and the width of the pixel edge portion of the fine electrode portion is wider than the width at the pixel center side. Liquid crystal display device.

(Supplementary note 29) The liquid crystal display device according to supplementary note 28, wherein fine electrode portions of the pixel electrode are arranged in substantially line symmetry or point symmetry.

(Supplementary note 30) The liquid crystal display device according to Supplementary note 28, wherein polymerization of the polymerization component is performed by ultraviolet irradiation treatment, heat treatment, or a combination thereof.

(Supplementary note 31) The liquid crystal display device according to Supplementary note 28, having an optical retardation film having a slow axis in a direction parallel to the substrate surfaces of the first and second substrates encapsulating the liquid crystal.

 (Supplementary Note 32) The first and second substrates disposed to face each other,

A liquid crystal having a negative dielectric anisotropy encapsulated between the first and second substrates;

It has a polymer which superposes | polymerizes and forms the superposition | polymerization component added in the said liquid crystal, and determines the direction in which a liquid crystal molecule inclines at the time of voltage application,

In the first substrate, a pixel electrode divided into switching regions and a plurality of regions having different alignment directions of liquid crystal molecules are formed for each pixel,

And two or more fine electrode portions having different directions extending from the pixel electrodes in each of the regions.

(Supplementary note 33) The first and second substrates disposed to face each other,

A liquid crystal having a negative dielectric anisotropy encapsulated between the first and second substrates;

It has a polymer which superposes | polymerizes and forms the superposition | polymerization component added in the said liquid crystal, and determines the direction in which a liquid crystal molecule inclines at the time of voltage application,

In the first substrate, a pixel electrode divided into switching regions and a plurality of regions having different alignment directions of liquid crystal molecules are formed for each pixel,

The pixel electrode is constituted by a plurality of fine electrode portions extending in a direction perpendicular to the data bus line.

(Supplementary note 34) First and second substrates disposed to face each other,

A liquid crystal having a negative dielectric anisotropy encapsulated between the first and second substrates;

It has a polymer which superposes | polymerizes and forms the superposition | polymerization component added in the said liquid crystal, and determines the direction in which a liquid crystal molecule inclines at the time of voltage application,

In the first substrate, first and second subpixel electrodes divided into a plurality of regions having different switching directions and liquid crystal molecules in different orientation directions are formed for each pixel.

The first subpixel electrode is constituted by a plurality of band-shaped fine electrode portions extending in a predetermined direction for each region and a connection electrode portion electrically connecting them to each other, and are directly connected to the switching element.

The second subpixel electrode is composed of a plurality of band-shaped fine electrode portions extending in a predetermined direction for each region and a connecting electrode portion electrically connecting them to each other, and are connected to the switching element through capacitive coupling. There is,

The width of the fine electrode portion of the first subpixel electrode is wider than the width of the fine electrode portion of the second subpixel electrode.

(Supplementary note 35) The liquid crystal display device according to Supplementary note 34, wherein in the first and second subpixel electrodes, the fine electrode portions are arranged substantially in line symmetry or point symmetry.

(Supplementary Note 36) The liquid crystal display device according to Supplementary note 34, wherein the polymerization of the polymerization component is performed by ultraviolet irradiation treatment, heat treatment, or a combination thereof.

(Supplementary note 37) The liquid crystal display device according to supplementary note 34, having an optical retardation film having a slow axis in a direction parallel to the substrate surfaces of the first and second substrates encapsulating the liquid crystal.

(Supplementary Note 38) The first and second substrates disposed to face each other,

A liquid crystal having a negative dielectric anisotropy encapsulated between the first and second substrates;

It has a polymer which superposes | polymerizes and forms the superposition | polymerization component added in the said liquid crystal, and determines the direction in which a liquid crystal molecule inclines at the time of voltage application,

In the first substrate, first and second subpixel electrodes divided into a plurality of regions having different switching directions and liquid crystal molecules in different orientation directions are formed for each pixel.

The first subpixel electrode is constituted by a plurality of band-shaped fine electrode portions extending in a predetermined direction for each region and a connection electrode portion electrically connecting them to each other, and are directly connected to the switching element.

The second subpixel electrode is composed of a plurality of band-shaped fine electrode portions extending in a predetermined direction for each region and a connecting electrode portion electrically connecting them to each other, and are connected to the switching element through capacitive coupling. There is,

And an area ratio of the first subpixel electrode to the total area of the first subpixel electrode and the second subpixel electrode is 10 to 70%.

(Supplementary note 39) The liquid crystal display device according to Supplementary note 38, wherein fine electrode portions of the pixel electrode are arranged in substantially line symmetry or point symmetry.

(Supplementary Note 40) The liquid crystal display device according to Supplementary Note 38, wherein the polymerization of the polymerization component is performed by ultraviolet irradiation treatment, heat treatment, or a combination thereof.

(Supplementary note 41) The liquid crystal display device according to supplementary note 38, having an optical retardation film having a slow axis in a direction parallel to the substrate surfaces of the first and second substrates encapsulating the liquid crystal.

(Supplementary note 42) The liquid crystal display device according to any one of supplementary notes 1, 12, 15, 19, 20, 28, 32, 33, 34, and 38, wherein slits are provided between the fine electrode portions.

(Supplementary Note 43) A liquid crystal display according to any one of Supplementary Note 1, 12, 15, 19, 20, 28, 32, 33, 34, and 38, wherein a strip-shaped dielectric film is formed between the fine electrode portions. Device.

According to the present invention, it is possible to provide a liquid crystal display device having an MVA mode having a substantially high aperture ratio and being applicable to a notebook computer and having good display quality even when viewed in an inclined direction.

Moreover, according to this invention, the liquid crystal display device of MVA mode which can further improve a substantial aperture ratio can be provided.

Further, according to the present invention, it is possible to provide a liquid crystal display device of MVA mode having a good display quality while avoiding the occurrence of display unevenness due to the photolithography process while being substantially applicable to a high aperture ratio and applicable to a notebook computer.

In addition, according to the present invention, it is possible to provide a liquid crystal display device having an MVA mode having a substantially high aperture ratio, applicable to a notebook computer, and having good response characteristics.

Claims (10)

First and second substrates disposed to face each other, A liquid crystal having a negative dielectric anisotropy encapsulated between the first and second substrates; It has a polymer which superposes | polymerizes and forms the superposition | polymerization component added in the said liquid crystal, and determines the direction in which a liquid crystal molecule inclines at the time of voltage application, Each of the first substrates includes a switching element, a plurality of strip-shaped fine electrode portions, a first subpixel electrode formed of a connection electrode portion electrically connecting them to each other, a plurality of strip-shaped fine electrode portions, and the like. A second subpixel electrode constituted by a connection electrode portion electrically connecting them to each other, A common electrode is formed on the second substrate to face the first and second subpixel electrodes; A first voltage is applied to the first subpixel electrode through the switching element, and a second voltage lower than the first voltage is applied to the second subpixel electrode. First and second substrates disposed to face each other, A liquid crystal having a negative dielectric anisotropy encapsulated between the first and second substrates; It has a polymer which superposes | polymerizes and forms the superposition | polymerization component added in the said liquid crystal, and determines the direction in which a liquid crystal molecule inclines at the time of voltage application, In the first substrate, a pixel electrode composed of a switching element, a plurality of strip-shaped fine electrode portions, and a connection electrode portion electrically connecting them to each other are formed in each pixel, And a notch at a portion of the tip portion of the fine electrode portion that does not face the adjacent fine electrode portion. First and second substrates disposed to face each other, A liquid crystal having a negative dielectric anisotropy encapsulated between the first and second substrates; It has a polymer which superposes | polymerizes and forms the superposition | polymerization component added in the said liquid crystal, and determines the direction in which a liquid crystal molecule inclines at the time of voltage application, In the first substrate, a pixel electrode composed of a switching element, a plurality of strip-shaped fine electrode portions, and a connection electrode portion electrically connecting them to each other are formed in each pixel, The shape of the area | region between the fine electrode parts of the base end side of the said fine electrode part is a shape which becomes line symmetry with respect to the centerline of the area | region between the said fine electrode parts. First and second substrates disposed to face each other, A liquid crystal having a negative dielectric anisotropy encapsulated between the first and second substrates; It has a polymer which superposes | polymerizes and forms the superposition | polymerization component added in the said liquid crystal, and determines the direction in which a liquid crystal molecule inclines at the time of voltage application, In the first substrate, a pixel electrode composed of a switching element, a plurality of strip-shaped fine electrode portions, and a connection electrode portion electrically connecting them to each other are formed in each pixel, The shape of the region between the microelectrode portions on the proximal side of the microelectrode portion has a cutout at a portion not facing the adjacent microelectrode portion among the tip portions of the microelectrode portion, with respect to the centerline of the region between the microelectrode portions. The liquid crystal display device characterized by the shape which becomes linear symmetry. First and second substrates disposed to face each other, A liquid crystal encapsulated between the first and second substrates, It has a polymer which superposes | polymerizes and forms the superposition | polymerization component added in the said liquid crystal, and determines the direction in which a liquid crystal molecule inclines at the time of voltage application, On the first substrate, A gate bus line extending in one direction, A data bus line extending in a direction crossing the gate bus line; A storage capacitor bus line in parallel with the gate bus line; A switching element formed for each pixel region partitioned by the gate bus line and the data bus line; A first portion constituted by a plurality of band-shaped fine electrode portions and a connecting electrode portion electrically connecting them to each other, having a plurality of domain control regions having different alignment directions of liquid crystal molecules, and directly connected to the first switching element. A pixel electrode, A plurality of domain control regions disposed in the same pixel region as the first subpixel electrode and constituted by a plurality of band-shaped fine electrode portions and a connection electrode portion electrically connecting them to each other, and having different alignment directions of liquid crystal molecules; A second subpixel electrode having: A storage capacitor electrode disposed at a position opposite to the storage capacitor bus line with a first insulating film interposed therebetween; A control electrode connected to the switching element, disposed at a position opposite to a boundary of the domain control region of the first and second subpixel electrodes, and capacitively coupled to the second subpixel electrode through a second insulating film; A storage capacitor lower electrode connected to the storage capacitor bus line and disposed at a position opposite to the control electrode with the first insulating film interposed therebetween, And a common electrode facing the first and second subpixel electrodes on the second substrate. First and second substrates disposed to face each other, A liquid crystal having a negative dielectric anisotropy encapsulated between the first and second substrates; It has a polymer which superposes | polymerizes and forms the superposition | polymerization component added in the said liquid crystal, and determines the direction in which a liquid crystal molecule inclines at the time of voltage application, In the first substrate, a pixel electrode divided into switching regions and a plurality of regions having different alignment directions of liquid crystal molecules are formed for each pixel, The pixel electrode is constituted by a plurality of strip-shaped fine electrode portions formed in each region and a connection electrode portion electrically connecting them, and the width of the pixel edge portion of the fine electrode portion is wider than the width at the pixel center side. Liquid crystal display device. First and second substrates disposed to face each other, A liquid crystal having a negative dielectric anisotropy encapsulated between the first and second substrates; It has a polymer which superposes | polymerizes and forms the superposition | polymerization component added in the said liquid crystal, and determines the direction in which a liquid crystal molecule inclines at the time of voltage application, In the first substrate, a pixel electrode divided into switching regions and a plurality of regions having different alignment directions of liquid crystal molecules are formed for each pixel, And two or more fine electrode portions having different directions extending from the pixel electrodes in each of the regions. First and second substrates disposed to face each other, A liquid crystal having a negative dielectric anisotropy encapsulated between the first and second substrates; It has a polymer which superposes | polymerizes and forms the superposition | polymerization component added in the said liquid crystal, and determines the direction in which a liquid crystal molecule inclines at the time of voltage application, In the first substrate, a pixel electrode divided into switching regions and a plurality of regions having different alignment directions of liquid crystal molecules are formed for each pixel, The pixel electrode is constituted by a plurality of fine electrode portions extending in a direction perpendicular to the data bus line. First and second substrates disposed to face each other, A liquid crystal having a negative dielectric anisotropy encapsulated between the first and second substrates; It has a polymer which superposes | polymerizes and forms the superposition | polymerization component added in the said liquid crystal, and determines the direction in which a liquid crystal molecule inclines at the time of voltage application, In the first substrate, first and second subpixel electrodes divided into a plurality of regions having different switching directions and liquid crystal molecules in different orientation directions are formed for each pixel. The first subpixel electrode is constituted by a plurality of band-shaped fine electrode portions extending in a predetermined direction for each region and a connection electrode portion electrically connecting them to each other, and are directly connected to the switching element. The second subpixel electrode is composed of a plurality of band-shaped fine electrode portions extending in a predetermined direction for each region and a connecting electrode portion electrically connecting them to each other, and are connected to the switching element through capacitive coupling. There is, The width of the fine electrode portion of the first subpixel electrode is wider than the width of the fine electrode portion of the second subpixel electrode. First and second substrates disposed to face each other, A liquid crystal having a negative dielectric anisotropy encapsulated between the first and second substrates; It has a polymer which superposes | polymerizes and forms the superposition | polymerization component added in the said liquid crystal, and determines the direction in which a liquid crystal molecule inclines at the time of voltage application, In the first substrate, first and second subpixel electrodes divided into a plurality of regions having different switching directions and liquid crystal molecules in different orientation directions are formed for each pixel. The first subpixel electrode is constituted by a plurality of band-shaped fine electrode portions extending in a predetermined direction for each region and a connection electrode portion electrically connecting them to each other, and are directly connected to the switching element. The second subpixel electrode is composed of a plurality of band-shaped fine electrode portions extending in a predetermined direction for each region and a connecting electrode portion electrically connecting them to each other, and are connected to the switching element through capacitive coupling. There is, And an area ratio of the first subpixel electrode to the total area of the first subpixel electrode and the second subpixel electrode is 10 to 70%.

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